Katy Perry and Robert Pattinson were spotted at a Bjork concert this weekend at the Hollywood Palladium in Los Angeles.
The Twilight actor and Part of Me singer have grown close in recent months following high profile splits from respective partners, Kristen Stewart and John Mayer.
The famous friends have reportedly been helping each other through the break-up blues, as friends say they have "serious chemistry".
"Katy and Robert have been spending a lot of time together recently and it’s safe to say there is serious chemistry," a source told Grazia magazine.
"But she doesn’t want to ruin their friendship by rushing into anything."
The couple attended the gig separately, keen to avoid photographers.
Last month the pair surprised guests at a wedding rehearsal in Santa Barbara, California which triggered rumours they were dating.
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