Tonight, a few of the biggest stars in music helped kick off the first-ever 'iHeartRadio Music Awards' full of over-the-top performance and plenty of winner's and loser's.

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Singer Rihanna took home the night's biggest prize for 'Artist of the Year' presented by Ryan Seacrest and JLo. The singer was spotted wearing a sheer Givenchy Couture dress by Riccardo Tisci and green lipstick. Her outfit certainly turned a few heads while singer Selena Gomez looked gorgeous in a maroon Cushnie et Ochs dress with minimal makeup.

Click through the gallery above to see our favorite looks from the first annual iHeartRadio Music Awards.

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