Graham Norton exudes charm as he gently mocks the celebrities that rotate around the chat show circuit, publicising their latest project. This week actress Reese Witherspoon is Norton's guest, ahead of the release of her action comedy, This Means War, on Valentine's Day. Joining her on the sofa is Lord of the Rings star Viggo Mortensen, who plays Sigmund Freud in A Dangerous Method.

Even before the final instalment of The Twilight Saga - Breaking Dawn, finished shooting, British actor Robert Pattinson had moved on to bigger things.

His co-star in his latest film, which opened this week, is a pretty 600 stone elephant called Tai.

Sadly, Graham Norton's sofa probably won't be large enough for Tai to join him on the show tonight. Instead, he'll have to settle for Robert's other co-star from Water for Elephants - Reese Witherspoon. This is actually the second time the two have worked together, because despite the tiny age gap between them, Robert was actually cast as her son in the 2004 movie Vanity Fair. It was a less than auspicious start to his Hollywood career though because his scenes were ­eventually cut from the film and can only be seen in the DVD version.

We're sure Graham will be quizzing Robert and Reese on their love scenes together in Water For Elephants.

But the relationship R-Patz fans really want to hear about is, of course, the one with his Twilight co-star and real-life girlfriend Kristen Stewart.

Don't hold back, Graham - we want to hear everything.