“Days of our Lives” alum Casey Deidrick (ex-Chad DiMera) has signed on to co-star alongside Emily Osment (“Hannah Montana”) in “A Very Merry Bridesmaid,” part of Hallmark Channel’s annual “Countdown to Christmas” programming block.

Airing Saturday, December 4, the TV movie follows Leah (Osment) on Christmas Eve, which also happens to be her 30th birthday and the same day as her brother’s wedding. Watch as Leah reunites with her childhood crush whose back in town for the wedding and is determined to make sure Leah’s birthday doesn’t go unnoticed.

Since leaving “DAYS” in 2013, Deidrcik has starred in such shows as “Eye Candy” for MTV and currently stars in The CW’s “In the Dark.” He’s also appeared in episodes of “Driven,” “Teen Wolf” and films “American Satan” and “Dog Days.”

Osment currently stars in the Netflix comedy “Pretty Smart” which details the experiences of Chelsea (Osment), a high-brow, Harvard-educated intellectual and aspiring novelist forced to move in with her bubbly, carefree, not-so-intellectual West Coast sister, Claire (Olivia Macklin), and her three lovably eccentric, not-so-intellectual roommates: Grant (Gregg Sulkin), a distractingly handsome personal trainer, Solana (Cinthya Carmon), a former lawyer turned healer, and Jayden (Michael Hsu Rosen), a social media influencer. The series premiered earlier this month on the streaming service.