Katy Perry red carpet grammy after party singer dress downtown

Ooh la la!

Katy Perry had a big night at the Grammys yesterday evening, and decided to celebrate by attending the Universal Music Group's 2014 afterparty in downtown L.A. with boyfriend John Mayer.

The singer looked stunning a floor-length silver gown as she walked the red carpet, and she was all smiles as she waved to fans on her way in to the bash. Her man opted to skip photos and interviews and wait for his lady inside the venue.

From the sounds of it, the couple really cut loose at the fete, though!

According to E!, the pair chugged champagne from the bottle with pals like Anna Kendrick and Kasey Musgraves.

The brunette bombshell sure knows how to have a good time!