William Hill have been forced to halve the price of Kirsten Stewart and Robert Pattinson getting engaged in 2014 from 16/1 to 8/1 following a flurry of bets in the last 24 hours.
"We think it's wishful thinking from their fans - but who's to say they don't get struck by Cupid's Arrow?" said William Hill spokesman Rupert Adams.
Ashton Kutcher& Katy Perry are odds-on to get engaged to their respective other halves this year - while Prince Harry is 2/1 to pop the question to girlfriend, Cressida Bonas.
Andrew Garfield& Emma Stone are 5/2 to get engaged, Tiger Woods is 4/1 to pop the question to Lindsey Vonn, and Madonna and her latest beau Timor Steffens are 7/1.
William Hill are offering 10/1 that any of these celebrity couples will get engaged on Valentine's Day:
1/3 Ashton Kutcher & Mila Kunis
1/2 Katy Perry & John Mayer,
2/1 Prince Harry & Cressida Bonas
5/2 Andrew Garfield & Emma Stone
3/1 Bruno Mars & Jessica Caban
3/1 Miranda Kerr & James Packer
4/1 Tiger Woods & Lindsey Vonn
4/1 Ellie Goulding & Jeremy Irvine
4/1 Niall Horan & Barbara Palvin
4/1 Rita Ora & Calvin Harris
6/1 Lee Ryan & Jasmine Waltz
7/1 Madonna & Timor Steffens
8/1 Kirsten Stewart & Robert Pattinson
10/1 Declan Donnelly & Ashley Roberts
12/1 Joey Essex & Amy Willerton