Are John Mayer and Katy Perry Getting Serious?

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After being spotted on a date last week, John Mayer and Katy Perry were "inseparable" this past weekend, first attending a party on Saturday night, and then attending a pool party on Sunday.

A source told Life & Style:

"Katy and John never left each other's side and were flirting and affectionate the entire time. Katy loved it!"

"I'd say Katy's more serious with John than she was with [her ex, Florence + the Machine guitarist Robert Ackroyd ]," says a source, who spotted the couple at a pool party this past weekend. "Everyone knew they were coming together as a couple ... Maybe he's a changed man, but Katy likes bad boys. I can't imagine John's changed that much."