Katy Perry has admitted being on a diet "absolutely sucks".

The 'Firework' singer is currently on a strict eating regime in preparation for her 'Teenage Dreams Tour' but revealed she occasionally lets herself have "cheat days" where she allows herself a burger.

US 'X Factor' bosses may shun Cheryl Cole for a homegrown star.

The singer has been tipped to join Simon Cowell on the judging panel of the pop star search show when it heads Stateside after impressing on the UK version, but producers are unconvinced and believe American audiences may prefer a more recognizable star such as Rihanna or Katy Perry.

Katy Perry keeps fit by skipping.

The 26-year-old singer enjoys five 25-minute workouts every week with personal trainer Harley Pasternak, who says her brief workouts are better for keeping her trim in the long term.

Designer Carlotta Gherzi would love to dress Katy Perry.

The Sado founder's label is loved by celebrities such as Chloe Sevigny, Cheryl Cole and actress-and-fashion designer Sienna Miller but Carlotta thinks her clothes would look best on the 'Firework' singer with 'Black Swan' star Natalie Portman another favorite thanks to her "star" quality.

Katy Perry took her grandmother to Las Vegas to celebrate her 90th birthday.

The 'Firework' singer and her new husband, British comedian Russell Brand, took her father Keith's mother Ann to the Planet Hollywood Resort and Casino in the famous gambling town, where they celebrated with a meal at Strip House steak restaurant.

Katy Perry is to guest star on 'How I Met Your Mother'.

The 'Firework' hitmaker will play Honey, the beautiful and naive cousin of architecture student Zoey (Jennifer Morrison) in one episode of the sitcom.