Sydney Leroux -- Bikinis, Bottles & Fat Jewish ... At Vegas Bachelorette Party!!

Better late than never ... at least when it comes to bachelorette parties -- 'cause even though U.S. soccer star Sydney Leroux already tied the knot, she still made time for a belated girls weekend.

As we previously reported, Leroux got married back in January in a very small ceremony -- but since it was during soccer season, she postponed the reception until mid-October.

But just because she's technically not a bachelorette, it didn't stop her from hitting Vegas with her BFFs this weekend ... where the gang partied at Surrender Nightclub while poppin' bottles of Dom and Grey Goose.

As for the celebrity cameo, we're told the group ran into The Fat Jewish while leaving dinner at Andrea's right before they hit the club ... and stopped to pose for a picture.