Rihanna Celebrates After Winning Four iHeartRadio Awards

It's been a big week for Bad Gal RiRi ... from her boobs being on full display in Lui magazine to winning big at Thursday evening's iHeartRadio Awards, she's all anyone seems to be able to talk about -- and that was before we got a peek at her latest ensemble!

After winning four prizes at the show (Artist of the Year, Song of the Year for “Stay," Hip Hop/R&B Song of the Year for "Pour It Up” and Best Fan Army), Rihanna went to Giorgio Baldi for a bite to eat. We could have predicted that...

Rihanna wore dark greenish-black lipstick and a see-through black number, but it was her twisty hairdo that really caught our attention. "Shout out to all the other people I’ve ever worked with,” she said while taking the podium last night in her 90s-inspired look. “I know I’m a pain in the *ss but it’s worth it because now we got the biggest award of the night.” Aww!

Click thru to see more winners from the show...