Katy Perry wants to date Robert Pattinson

Singer Katy Perry told the "Twilight" star Kristen Stewart that she would like to date her boyfriend Robert Pattinson if he becomes single again. Robert Pattinson and Kristen Stewart always hit the gossip column for their on and off relationship. Pattinson and Stewart recently reunited after a brief break-up. They celebrated Easter together and have been living together.

Katy Perry who is a close friend of Robert Pattinson expressed her desire to date Robert and he was shocked. Kristen and Perry were partying in a club when the 'Fireworks' hitmaker told Stewart that she would want to date Pattinson, reported Sun Online.

"Kristen looked like she wanted to run away after Katy's comments," said a source

Stewart then questioned Pattinson whether "rumours of them (Perry) hooking up in the past are true".

Robert Pattinson and Kristen Stewart have patched up after a brief break-up and now they are very much in love while Perry who was earlier married to Russell Brand, recently drifter apart from singer-songwriter John Mayer.

To Celebrate Stewart's 23 birthday, Robert Pattinson has decided to girl his girlfriend Bentley fountain pen to add collection of her writing tools.

A source told the Daily Star newspaper, "Kristen has always collected pens, and has a variety of stylish ones. Rob decided to go big for her birthday this year and brought her a limited edition white gold Tibaldi Bentley Crewe fountain pen.

"He had her name specially engraved on it with the year and wording: 'From R'.

"There are only 40 of these pens in the world, so it's a real collector's item."