Kellan Lutz 30th Birthday a Real Croc!!!

3/15/2015 7:29 AM PDT

Kellan Lutz 30th Birthday Party ... A Real Croc!

EXCLUSIVE

Kellan Lutz celebrated his 30th birthday Saturday night with a flair ... at Dan Bilzerian's Hollywood Hills pad.  

There were hot naked chicks and dudes wearing very little, per the invitation, which says, "The pool is heated to 95 degrees, and the Jacuzzi is on!  We bought 150 white towels, and encourage everyone to bring a bathing suit (white bathing suit preferred)."

Everything was white.  The invite makes it clear it's "an all white party.  You will not get in if you are not wearing all white."

The only other celebs we spotted were boxer Victor Ortiz and "Twilight" star Ashley Greene.