Kylie Minogue has been been getting ready to host the 2009 Brit Awards at Earls Court in London. But what is it that's making her laugh so much in rehearsals?
Perhaps it's these guys. Kylie isn't the only host - comedians James Corden and Mat Horne will be helping out, and it seems they've got their outfits mixed up with Kylie's!
There's no danger Chris Martin from Coldplay will mix up his clothes with anyone else - he's been wearing that jacket for ages.
U2 are another big band performing at the Brits on Wednesday. Lead singer Bono looks like he's getting into the right mood for a top show.
It looks like both Kylie and Mat are going to be kept busy during the Brits, with a fair few costume changes lined up.
Estelle will be hoping to head home with the award for best British female. She's been tipped to perform with The Ting Tings.
At the end of the show the Pet Shop Boys will be handed the outstanding contribution to music award, before getting on stage for an interesting looking performance.
They'll be joined on stage by some pretty big names from the moment, Lady Gaga and Killers lead singer Brandon Flowers.
After the rehearsals came the arrivals. Loads of celebs glammed up to make their entrance on the red carpet, but how long do you think it took Girls Aloud to get ready?
Cheer up The Ting Tings! They don't look too happy here, but it could be nerves... they're up for two awards, best British album and best British breakthrough act.
Calvin Harris isn't up for any awards, but that didn't stop him attracting lots of attention on the red carpet. Check out those specs!
Katy Perry looks pretty relaxed as she masters the art of signing autographs for fans at the same time as posing for photographers.
And who's Holly Willoughby spotted in the crowds? She looks pretty happy to see them...
Maybe it was her mate, Fearne Cotton who's presenting backstage extras during the show.