Their fans are used to seeing Zac Efron and Channing Tatum either on the red carpet - all tuxedos and tails - or on the big screen, always looking their effortless best - courtesy of makeup, lighting and a team of assistants to hold umbrellas and pour coffee on demand.
Zac Efron gets into action, ably abetted by resident hardman Bear Grylls
Bear Grylls' new series 'Running Wild With Bear Grylls', however, will bring out another side of these Hollywood hunks, as TV's most renowned adventurer Bear Grylls takes them, plus four other celebs - Ben Stiller, Tom Arnold, Tamron Hill and Delon Sanders - into the wild, and invites them to discover their inner man over the course of a solitary 48 hours in some of the world's most remote locations - from the cliffs of Utah to the torrential rainswept valleys of Scotland.
So, who do you think will emerge in the finest condition, chopping wood with bare hands, starting fires with the glint in their steely eye, and who will be crying for their teddy bear, or at least their mobile phone?
According to fans waiting for the show, it's all about Zac Efron, with his arrival on the show prompting a stunning 32,000 excited tweets last week alone - many, it would seem, pretty pleased by the prospect of Zac potentially shirtless...
Can't think why...
But 'Foxcatcher' and 'Magic Mike' star Channing has his own fanbase, also clamouring to see him in action...
Bear Grylls himself is not forgotten...
Which is all very well, but would seem to be a massive oversight on the part of fans, forgetting Ben Stiller's multi-capable alter ego. After all, surely if you're stuck in the jungle with any of this lot, there's only one to turn to in a crisis... step forward one Mr Zoolander...
'Running Wild with Bear Grylls' airs tonight on Discovery Channel. All TV trends data referred to in this article has been supplied by Virgin Media, which provides access to up to 260+ channels including Discovery, Freeview Channels, Fox TV, Virgin Movies, Sky Movies and Netflix.