One Direction Celebrate With Bubbly From SiCo?
According to Katy Perry.
Niall later tweeted a snap of the kiss, writing: "@NiallOfficial: @katyperry looks like its official ... me and you."
The Part Of Me singer responded by tweeting: "I'll be your Mrs. Robinson..."
But it looks like Niall may have to wait a while because, according to the Daily Mail, Katy later joined on/off BF John Mayer for dinner at an Italian restaurant in Beverly Hills.