Valentine's Day 2013: Stars tweet about love and romance

Mariah Carey and Nick Cannon kiss at the 12th Annual BMI Urban Awards at Saban Theatre on Sept. 7, 2012, in Beverly Hills, Calif. / Getty

Stars have taken to Twitter to share thoughts of love and romance on this Valentine's Day.

• Complete coverage of Valentine's Day

40 Photos

Valentine's Day: Celebrity kisses

For Mariah Carey, the holiday started Wednesday with a romantic evening alongside her husband, Nick Cannon. Rapper 50 Cent, meanwhile, offered to be a valentine for anyone who doesn't have a special someone this year. And Ryan Seacrest tweeted at his girlfriend, Julianne Hough, to remind her not to be late for their Valentine's date.

Read on to see how celebrities are spending Cupid's holiday.

Happy Valentine's Day lovers!!!! Our valentine's day began last night...TBC: ) @nickcannon twitter.com/MariahCarey/st...

— Mariah Carey (@MariahCarey) February 14, 2013

Happy valentines day Tweeties. I'm snuggled on my couch with my son, totally in love :)

-- Brooke Burke-Charvet (@brookeburke) February 14, 2013

Enjoying Valentine's Day treats, but still making good on our New Year resolution: brushing and flossing after we eat!

-- Jennie Garth (@jenniegarth) February 14, 2013

To those who r in love, Happy Valentines Day! To those who don't have that special someone, Happy Wish I Was Dead Day!;^P

-- Jim Carrey (@JimCarrey) February 14, 2013

It comforted her to think that all the valentines she was forced to make in kindergarten were meant for him, she just hadn't known it yet

-- Lena Dunham (@lenadunham) February 14, 2013

I am in Playboy.Happy Valentine's Day ladies playboy.com/playground/vie...

-- Jimmy Kimmel (@jimmykimmel) February 14, 2013

Happy Valentine's day to all my fans. I appreciate your support over the years.

-- Kevin Spacey (@KevinSpacey) February 14, 2013

Happy Valentine's Day to all the lovers out there! <3

— Jordin Sparks (@JordinSparks) February 14, 2013

Happy Valentines Day you ladies.Though its a conspiracy of chocolatiers,florists&Jewelers,It is a great excuse to give some ladies some love

-- ian somerhalder (@iansomerhalder) February 14, 2013

Happy Valentine's day to every women who read's this. If you don't have anyone special at the moment. I'm your Valentine #SMSaudio

-- 50cent (@50cent) February 14, 2013

From me to you on Valentine's Day! bit.ly/hjkhfay67

-- Kim Kardashian (@KimKardashian) February 14, 2013

Happy Valentines Day

— Russell Crowe (@russellcrowe) February 14, 2013

Happy Valentine's Day!!

-- Keith Urban (@KeithUrban) February 14, 2013

Best Card Ever! Thank U ALL for the love and support. this made my day!bit.ly/Vu9tjS#girlfriend twitter.com/justinbieber/s...

-- Justin Bieber (@justinbieber) February 14, 2013

Dont be late tonight ;) RT @juliannehough: Happy Valentines Day to my Valentine :) @ryanseacrest instagr.am/p/VuDArPif5O/

— Ryan Seacrest (@RyanSeacrest) February 14, 2013