From the sound of it, Britney Spears has a crush on Ben Stiller.

No, Spears hasn't suddenly gone public with a post-Justin romance. The mushiness arises between the pop princess and one-time king of the music video cameo when they each lend their voice to reindeer in two holiday TV specials.

Spears will play Donner, one of Santa's nine -- if you count Rudolph -- flying beasts of burden, in a pair of 30-minute specials about Robbie the Reindeer, set for broadcast December 13 at 9 p.m. ET/PT on CBS, according to a network spokesperson. Stiller provides the voice of Robbie.

For those unfamiliar with the hoofed hero, he originated in the U.K., the star of the award-winning, 1999 BBC special "Robbie The Reindeer in Hooves of Fire." Animated with 3D models, the show has been re-voiced for U.S. audiences.

Spears' Donner has the hots for Robbie, who is trying to earn a spot on Santa's team. The only problem is that Robbie is intent on playing "reindeer games" with the aptly named Vixen (voiced by Leah Remini of "The King of Queens").

The exclusive-to-the-U.S. second episode, "Robbie The Reindeer in Legend of the Lost Tribe," has Robbie and some Vikings duking it out with that pain-in-the-hoof (and ex-con released on good behavior) Blitzen, who's trying to launch a reindeer theme park. Robbie, Donner, Prancer and others are determined to stop him and his underhanded ways.

Hugh Grant, Jim Belushi, Jerry Stiller and CBS Sports' Dan Dierdorf and Dick Enberg, posing as announcers of the Reindeer Races, are other recognizable voices in the program.

The original version of "Hooves of Fire" was broadcast on the Fox Family Channel earlier this year, featuring the voice of British pop star Robbie Williams, whose role has been filled by actor James Woods in the domestic version.

MTV's parent company, Viacom, also owns CBS.