Leonardo DiCaprio: Hottest Ex-Girlfriends Club Assembles

Leonardo DiCaprio's exes Kelly Rohrbach and Erin Heatherton were super tight -- in a serious hip-lock -- at the S.I. Swimsuit bash in NYC.

The leggy, smoking hot blondes seem to be doing just fine in their post-Leo lives. Look for more of Kelly in the new "Baywatch" movie -- she's playing Pam Anderson's character, C.J. Parker -- and look for more of Erin ... in your dreams.

We'd say Leo's ears were ringing Tuesday night, but it was probably a different body part.