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Justin Bieber may not have nailed it with his red carpet look at the American Music Awards on Sunday night, but he's still a babe as far as we're concerned!

The 21-year-old superstar is set to perform at tonight's show, and he's reportedly doing a mashup of some of his latest hits, including “What Do You Mean?” But who cares about THAT when Biebs was spotted serenading ex-girlfriend Selena Gomez over the weekend during a hot date at a hotel in Beverly Hills! Seems like Jelena is back on, and we're dying to know where this is going!

Of course SG was at the show, and while she didn't join her on-again flame on the red carpet, we have a feeling she caught his eye in this sexy red Givenchy gown. We wouldn't be surprised if we snapped these two in a limo together later tonight ... especially since Bieber has a big reason to celebrate. His hit track, “Where Are U Now,” which he recorded with Jack U‘s Diplo and Skrillex, won Collaboration of the Year.