Just three months after his romantic Italian wedding to Hollywood actress Jessica Biel, Justin Timberlake tweeted a message of love to his new wife. ""Happy V-day!!! Grab somebody and kiss 'em (or just say Happy Valentine's Day to them. Actually, yeah... Just do that. Or, just kiss 'em!) !!!?" wrote the Senorita singer.
He wasn't the only A-lister to be making publications of love.
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Comedian David Walliams' romantic side was revealed when his model wife Lara Stone posted a picture of some white roses bearing a card that read "For my beautiful mama, who I love lots and lots and lots Bert x", in reference to the couple's pet dog.
Celebrities were keen to share photos of the Valentine's Day bouquets they had received.
TV presenter Christine Bleakley, who is engaged to Chelsea footballer Frank Lampard, showed off some deep red roses with the caption "Happy Valentine's Day all. My lovely fiancé has spoilt me xx." As did Lisa Snowdon whose bunch of red roses was interspersed with some purple flowers and green foliage.
Some photos were a little steamier, including Mariah Carey's intimate photograph of herself in a luxurious bubble bath surrounded by candles. The We Belong Together singer tweeted "Getting ready for my Valentines Rendezvous consumed by bubbles.. Oh dear.." before uploading several shots of her romantic evening with husband Nick Cannon.
The couple, who are parents to one-year-old twins Moroccan and Monoe, dressed up in red and black outfits and enjoyed a ride on a horse drawn carriage, stopping to share a sweet kiss. Mariah tweeted, "A kiss delicately scented with horse dung.... Still romantic though.."
Also marking the special day were the Kardashian sisters. Kylie and Kendall Jenner and Kourtney, Khloe and Kim Kardashian each took to their social media sites for the occasion. Kylie chose to acknowledge 'Throwback Thursday', the day when users re-post old photos, and uploaded a picture of herself holding a sign saying 'Hopeless Romantic' from Valentine's Day 2012.
Kylie's sister Kendall enjoyed the day's loving atmosphere and tweeted "Cute little old men make me so happy" while Khloe posted photos of herself and husband Lamar Odom on her instagram. Kourtney released a video for her fans wishing them a "a beautiful, lovely day filled with love."
Kim also uplaoded a Throwback Thursday photo of herself with rollers in her hair and the caption: "Me and Kylie being silly a few years back! How she has grown since then! Crazy how time flies… Love you Kylie!!!! Xo"
Proving that Valentine's Day isn’t just about the partner in your life, several celebrities tweeted photos of their youngsters. Mylene Klass, Michelle Heaton and Peaches Geldof cuddled up with their children for some cute twitter pics.
Mylene's daughters, Hero and Ava, used their hands to feature in the singer's artisitc picture, spelling out the word 'love'.