It's been a day of expressing love and gratitude, with celebrities taking to Instagram to pay tribute to their partners and their families.
Valentine's Day has been extra special for some stars, including Kimberley Walsh who has a new baby Valentine this year, her newborn son Cole. Strictly Come Dancing's Janette Manrara and Aljaz Skorjanec are celebrating their last Valentine's Day as an engaged couple, with their wedding set for 2017. Other couples are marking another happy year of marriage, including Catherine Zeta-Jones and Michael Douglas.
Meanwhile, pregnant stars Rochelle Humes and Danielle Lloyd have been spoilt rotten by their partners. Chocolates, roses and gifts have been the highlight of the day!
Click through our gallery to see how the stars are celebrating...
Ayda Field received a handmade card from her hubby Robbie Williams, who declared that he loved his wife more than raving, truffle burgers, the pyramids and "my metabolism when it rocked," among other things.
Ayda captioned her Instagram snap: "Look what beautiful card I woke up to today from my amazing hubby @robbiewilliams #bestcardever #valentines #whenyouknow #ryda #loveofmylife Wishing everyone a Happy Valentines Day, filled with lots of #love and #chocolate."
Rebecca Adlington's daughter Summer made the cutest love-filled card for her mum, who split from husband Harry Needs a year ago.
Becky, as she is known by her friends, wrote: "My valentine ? even got a card #happyvalentinesday #love."
The single mum, 27, also uploaded a note that read: "You shouldn't need one day a year to tell someone you're in love with them, you should tell them all the time. However, we all get caught up in day to day life and today is a great reminder of how important love it."
Strictly Come Dancing pro Janette Manrara shared a super sweet post with her fiancé Aljaz Skorjanec, revealing that this would be their last Valentine's Day as an engaged couple.
"Happy Valentine's Day everyone! Here is a photo of @aljazskorjanec & I before we started dating! Who knew then that in 2017 we'd be getting married...... ❤" she wrote.
Catherine Zeta-Jones puckered up to her husband Michael Douglas in an idyllic beach snapshot, writing: "It's that glow that comes when you are in love." Happy Valentine's Day darling. #ValentinesDay."
Kimberley Walsh and her husband Justin Scott had an extra special Valentine's Day this year, following the birth of their second son Cole in December.
The Girls Aloud singer wrote: "Breakfast in bed this morning with my boys ?Happy Valentine Day to you all ❤️??#valentines #happyvalentinesday #boys #love #filterneeded."
Coleen Rooney had not one but four Valentines this year. The doting mum wished her husband Wayne and their three sons Kit, Kai and Klay the happiest day. "Happy Valentines Day to my 4 boys ❤️❤️❤️❤️," she posted.
Rochelle Humes, who is expecting her second child with husband Marvin, was spoilt rotten on Valentine's Day morning. Alongside a photo of a beautiful bouquet of red roses and a box of chocolate-covered strawberries, she wrote: "Waking up to this is always okay with me...Happy Valentines ❤️ @marvinhumes."
Rochelle also shared a video of her and Marvin at a concert and captioned it: "Forever my Valentine."
Marvin, likewise, posted a photo of his wife and wrote: "Happy Valentines Day to my Queen..Forever the light of my life..love you baby x"
Ola Jordan wrote a touching letter to her husband of 14 years James on Instagram, describing what love means to her. She posted: "Living with the person you love is not what everyone thinks it is. It's not waking up early every morning to make breakfast and eat together. It's not cuddling in bed together until both of you peacefully fall asleep. It's not a clean home and a homemade meal every night. It's fights about who has to put the dishes away.
It's screaming and crying because you've had a hard day and came home to the laundry not being done even though you asked them 5 times to do it. It's falling asleep on separate couches because the day has left you too exhausted to move to the bed. It's fighting over financial problems. It's waking up to all of the chocolate you bought for yourself, already eaten.
It's someone who steals all the covers and knees you in the face because the bed is too small for both of you. It's slammed doors and harsh words, fights and name calling. It is, despite those things, the one thing you look forward to every day.
It's coming home to the same person everyday that you know loves and cares about you. It's laughing about the one time you accidentally did something stupid. It's about eating the cheapest and easiest meal you can make and sitting down together at 10pm to eat because you both had a crazy day. It's when you have an emotional breakdown and your love lays on the floor with you and holds you and tells you everything is going to be okay, and you believe them❤️.
It's when "Netflix and chill" literally means you watch Netflix and hang out. It's about still loving someone even though they make you absolutely insane. Living with the person you love is countless fights about absolutely nothing, but is also having a love that people spend their whole life looking for. It's not perfect and it's hard, but it's amazing and comforting and the best thing you'll ever experience.
I love you @jamesjordan1978 ❤️ #valentinesday #love #husband."
Mum-of-two Giovanna Fletcher gave her Instagram fans an insight into how she and husband Tom would be celebrating.
She uploaded a throwback photo from their wedding day, writing on Instagram: "This guy... That look! The way he loves me even though I can be a total pain in the backside... No one is perfect, but he's my type of perfect - perfectly flawed, complex, loving, funny, passionate, loyal and creative. I'm so lucky to call him my best friend. Will you be my valentine, @tomfletcher? Pjs, takeaway pizza and a film on the sofa??? ?❤?xx"
Katie Piper spent the morning of Valentine's Day en route to... Paris! "One more stop to @disneylandparis I think I'm more excited than Belle!" the author wrote.
Guy Ritchie and Jacqui Ainsley were treated to a very sweet surprise come Valentine's Day morning. Their three children had written out their names using pipe cleaners. "Our gift from our ???s this morning ?," wrote Jacqui.
WATCH: Guy and Jacqui's wedding video
The model also posted a selfie with her director husband and captioned it: "Happy Valentine's everyone ❤️???I adore you Husband ? #Love #Unity #AnyExcuseToSpreadTheLove."
Iman posted a bittersweet photo of her and husband David Bowie kissing, just weeks after she marked his first death aniversary. "My forever Valentine #BowieForever #ValentinesDay," the model wrote.
Newly engaged Zoe Hardman paid tribute to her husband-to-be Paul Doran Jones, with whom she has a baby girl, Luna.
"Happy Valentine's Day to this one, @pauldoranjones...he's got the biggest heart, the kindest soul & he's my partner in crime #luckygirl ❤ you xx" she posted.
Sam Faiers shared a gorgeous photo of her two Pauls - her boyfriend and their adorable son. "My valentines ❤ My world," the former TOWIE star wrote.
EXCLUSIVE: Sam and Billie talk Paul and cousin Nelly's sweet bond
Danielle Lloyd wished her Instagram followers the happiest Valentine's Day, by posting a photo of her three sons in their school uniform, resting on her bed. "Happy Valentine's Day from me and my family hope you all have the most amazing day filled with love ❤," the pregnant star wrote.
Bindi Irwin posed with her boyfriend Chandler Powell in a sweet Instagram photo, writing about how "blessed" she is to be surrounded by people she loves.
"Valentine's Day. A day to celebrate love and happiness. (And an excuse to give endless amounts of hugs!) This picture captures my forever Valentine @chandlerpowell, in gorgeous #Australia ?? These really are the pictures of true happiness. I am blessed to be surrounded with the people that I love with all my heart. The power of love is undeniable and the glue that holds us all together. To have real balance in life, we must find the light in every day. So here's to love, to hope, to peace and kindness."
"Happy Valentine's to my soul mate, my best friend... ❤️❤️❤️ #love," Rebekah Vardy captioned an image of herself and husband Jamie.