Media playback is unsupported on your device Media caption Tom Cruise and Cameron Diaz keep the results of their track time secret

Film stars Tom Cruise and Cameron Diaz will appear on this weekend's edition of Top Gear, the BBC has confirmed.

The duo, who are in the UK to promote their action-comedy film Knight and Day, will take part in the Star In A Reasonably Priced Car segment.

"We've have never, ever had two bigger guests," said a statement on the show's official website.

"For the past week, the air in the office has been alive with a sort of sweaty-palmed excitement."

Knight And Day will receive its UK premiere in London on Thursday night.

The movie, about a regular woman who becomes embroiled with a lethal secret agent, has fared badly in the US, where it has only made $70m (£59m) at the box office - compared to a reported budget of $117m (£76.5m).

Reviews have been mixed, with the Wall Street Journal criticising its "unspecial effects" and Time Out branding the plot "smug and callous".

Time Magazine, however, said the "slick, proficient" film was "proof that you should never count Cruise out", despite a recent run of bad press.

Top Gear will be shown on BBC Two this Sunday, 25 July, at 2000 BST (1900 GMT).