Selena Gomez justin bieber denim hat studio craig's dinner

Just because we didn't photograph them together doesn't mean they didn't spend the night -- because that's exactly what went down on Monday evening!

Selena Gomez had dinner at Craig's Restaurant in West Hollywood, and after stopping by the recording studio, the 21-year-old singer went to Montage Hotel in Beverly Hills, where on-again beau Justin Bieber is staying. Selena arrived around 1am, and a photographer on the scene tells X17online that the starlet looked "as giddy as could be" on the way in. Hey, she's got the fever!

The duo have been inseparable since reuniting earlier this month, and with romantic dinner dates, nights at the club and a trip to the zoo, we have to wonder how long their latest reunion will last.

“Justin reached out to Selena when he was getting tons of backlash for his controversial race joke. He told Selena that he really missed her, that she was the ONLY one who truly understood him and that he needed her by his side,” an insider told HollywoodLife. “He also told her that she was his one and only soulmate and that he was lost without her. Words that Selena had longed to hear, even though she’s basically heard them before. Yep, they are crazy about each other … once again.”