The 'Dark Horse' singer, who split from the singer-songwriter, 36, in February, refuses to respond to his texts or calls, and has no interest in a rebound romance.
A source close to the 29-year-old star told PEOPLE.com: ''Katy will not let romance derail her life right now. She is happy being single. I don't see her getting into another relationship for a very long time. Why would she? She has a fantastic career, a ton of friends and is generally happy with things. She thinks that a relationship will complicate things right now.
''Katy has always been a romantic, but she knows that it doesn't all have to happen immediately. She doesn't need to have the prince on the white horse now. She'll wait, and take care of herself in the meantime.''
The 'Roar' hitmaker dyed her hair slime green earlier this week and feels extremely confident following the makeover.
The insider said: ''She finally decided, 'f**k it. I'm going to do what I want to do and I don't care what people think. Her hair is an outward statement of her freedom.''
Katy is set to kick off her 'Prismatic' world tour on May 8 and is pouring all of her energy into preparing for the shows.
The friend explained: ''She's looking for something show-stopping [for her tour]. Something that will grab the attention of everyone. She can't focus on that if she's dating someone. Right now, she needs to have a one-track mind, and it can't be about a boyfriend.''
Director Mat Whitecross claims that the recently released documentary movie 'Supersonic' has made things worse between Noel and Liam.
The trailer for the fifth 'Underworld' movie sees Selene being as badass as ever.
In a radio interview on Tuesday, Mars said he was initially put off by Adele's attitude when they worked together for 'All I Ask'.
Phil Collins and the Roots makes for an epic supergroup.
An old trailer with the confirmation we've all been waiting for.
The pair made their first public appearance together this week.
'House' star Laurie received star number 2,593 on the Hollywood Walk of Fame this week.
Though Derek and Hansel have left the world of fashion modelling behind them, a part...
The Smurfs are back in a brilliant movie sequel that sees them take on evil...
The Smurfs return following a harrowing experience lost in New York while being pursued by...
Brit award-winning popstar Katy Perry discusses her Christian upbringing and how songwriting has become, in...
A simplistic approach means that this charming adventure-comedy will only appeal to very young children....
Standing three apples high, the tiny Smurfs live happily and peacefully in their medieval Smurfs...