Julianne Hough — I’m Single, I’m HOT … and I’m Ready to Mingle!

Exclusive 031813_julianne_hough_v2_launchDidn”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 our sources has the footage.

Hough — along with her brother Derek and former old “Dancing with the Stars” pal Maksim Chmerkovskiy — kicked it 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).