KATY Perry is pop’s biggest boob fan – we have the proof.

Her tour pal Charli XCX revealed the Firework singer was so obsessed with her boobs she undid her bra during a mᴀssage.

But she’s not the only curvy celeb to have had their ᴀssets admired – and grabbed – by Katy.

The star, 30, has admired the ᴀssets of Miley Cyrus, Anna Kendrick and Kate Beckinsale – as well as, of course, long being fixated with her own 32D chest. Brit Charli said: “Supporting Katy was fun.

“She made me a chicken salad one day and she undid my bra on the last day through my T-shirt. It was very skilful.

“We were just talking in the corridor. I thought she was giving me a back mᴀssage. I was like, ‘This is really nice’, and then she undid my bra. I was like, ‘Oh cool’.”

Pitch Perfect actress Anna Kendrick once revealed how Katy Perry re-enacted a Sєx act on her breasts.

She said: “Katy Perry *****-****** my cleavage. I was kind of asking for it.

“If nobody had done it I would’ve been a little sad and she’s aggressive. I like it.”

Only a few months later Katy couldn’t resist grabbing another squeeze of the redhead’s boobs.

The breast love is clearly mutual though with Anna, 29, tweeting a lot about Katy’s cleavage during her Super Bowl half-time show last year.

She tweeted: “@katyperry is about to jump repeatedly in a small outfit. So we all have that #boobs #stillstaringattheтιтtiestho.”

Miley Cyrus, 22, has also felt the love from Katy’s wandering hands – although the wildchild singer was more than happy to return the favour.

That was nothing though – the pair have snogged during one of the Wrecking Ball singer’s concerts with Katy joking “who knows where that tongue has been”.

Underworld actress Beckinsale also revealed she had her “boobs groped” by the singer during one of her concerts.

But Ellen DeGeneres and wife Portia gave Katy a taste of her own medicine as they jokingly ogled her chest when she wore a particularly revealing and тιԍнт-fitting gown.

But Katy is her own biggest fan and revealed how as a flat-chested child she prayed to God for a bigger bust.

She said: “I lay on my back one night and looked down at my feet, and I prayed to God.

“I said, ‘God, will you please let me have boobs so big that I can’t see my feet when I’m lying down?’ At age 11.

“God answered my prayers. I had no clue they would fall into my armpits eventually.”

But she’s a generous soul and in 2010 shared the love by auctioning off a plaster cast of her boobs to charity for £1,800.

Katy’s boobs have been controversial. In 2010, Sesame Street decided against airing a segment featuring her singing with Elmo because her top was cut too low.

She responded by wearing an extremely revealing T-shirt with the fluffy puppet’s face on.

Her other iconic boob-baring moments include her whipped cream bra gun in the California Gurls video and her glowing chest in the one for Firework.