A-list couple Katy Perry and John Mayer paired up their fancy dress outfits to celebrate Katy's 28th birthday.
The pair looked to be going strong as Katy arrived at the Los Angeles bash wearing a vampire outfit. John, meanwhile, had chosen to go as a vampire slayer.
In keeping with the bloodsucker theme, Twilight's own Kristen Stewart was there to join in the party, as well as How I Met Your Mother star Neil Patrick Harris.
The star will turn 28 on Thursday, two days after what would have been her two-year wedding anniversary with comedian Russell Brand.
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