Didn't take long for Julianne Hough to come down with a case of post break-up hotness ... 'cause Ryan Seacrest's ex-GF was SMOKIN' during a night with girls this weekend ... and TMZ has the footage.
Hough -- along with her brother Derek and former old "Dancing with the Stars" pal Maksim Chmerkovskiy -- kicked it outside Beacher's Madhouse at the Roosevelt Hotel in Hollywood this weekend ... just days after calling things off with Seacrest.
Judging by her tight, short dress ... it seems Julianne is on a mission to rebound.
Another interesting point -- we noticed Hough puffing on a cigarette ... something she probably couldn't do while dating Ryan (a well known health and clean freak).
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