Katy Perry Dons Cut-Out Cleavage Dress At Brazilian Premiere Of 'Part Of Me' (PICS)

Katy Perry has a film to flog, so what better way to promote it than by donning a cleavage baring dress?

As K-Pez turned up at the Brazilian premiere of her docu-film Part Of Me last night, she opted to parade her assets to the world in a yellow dress with cut-out detailing across her chest.

Katy then changed into a stunning floor-length silver gown later in the evening.

She also debuted a new sleek bob, returning to her trademark black colour, after trying out blonde, pink, blue and purple in recent months.

Katy has recently been linked to John Mayer, after her romance with Florence + The Machine guitarist Robert Ackroyd cooled.

She and John had a short romance back in 2009 before her failed marriage to Russell Brand and were spotted getting reacquainted with each other in Miami last week.

A source told Perez Hilton: "They were so flirty and all over each other that night at the bar, they really liked each other. Their personalities just clicked and they were flirting and dancing and it was on."

> IN PICS: KATY'S STYLE EVOLUTION