Ross Lynch Bares Bum with Brothers Rocky & Riker on Instagram - See The Pic!

Riker, Ross and Rocky Lynch bared their butts in a new picture on Instagram.

The eldest of the three, Riker, 24, posted the pic on his account with the three brothers baring almost all of their bodies.

“When there’s only 1 shower and it’s running low on hot water…” he captioned the shot.

PHOTOS: Check out the latest pics of Riker Lynch

R5 just kicked off their second US leg of the Sometime Last Night tour in Stockton, Calif.

Click inside to see the full Instagram pic that Riker posted!