The couple, who began dating last December after both starring on the ITV talent show, are celebrating their first Valentine's Day together this year.
Taking to Twitter this morning (14 February), Sam said: "Happy Valentine's day @OfficialTamera. You're so special to me! I love you xxx <3 Here's to many more of Valentine's days together!"
Sam and Tamera are currently on the X Factor arena tour, which sees them perform a string of dates across the UK and Ireland.
Happy Valentines day @OfficialTamera You're so special to me! I love you xxx <3 Here's to many more of valentines days together!— Sam Callahan (@samcallahan94) February 14, 2014
The pair have been inseparable during the tour and earlier this month, Sam and Tamera also posed for their very own "Samera selfie" in a new Twitter photo.
The couple were romantically linked during last year's show, but both kept quiet about their blossoming romance at the time, insisting that they were just close friends.
But once the show ended, they opened up about their relationship and, judging by Sam's tweet, he's definitely smitten!
Sam and Tamera are being joined on tour by former contestants Abi Alton, Hannah Barrett, Sam Bailey, Luke Friend, Rough Copy, Nicholas McDonald and winner Sam Bailey.
The group will be on the road until 29 March, where the tour will wrap up in Birmingham.
£2.49/month – that's all is costs for 4 issues of the REVEAL early edition. Gossip too good to wait for! Subscribe today!
See who else is celebrating their first Valentine's Day together in the gallery below:
Copyright: Twitter @NatashaOfficial