Kate Moss is throwing a karaoke party for her daughter's seventh birthday.

The British supermodel will host a sing-a-long bash at her north London home today (02.10.09) for Lila Grace - who celebrated her birthday on Tuesday (29.09.09) - and will be taking to the microphone herself.

A source said: "Kate has been preparing for Lila's birthday for weeks. She is pulling out all the stops to give her a really memorable day. It's a karaoke party and Kate is really looking forward to belting a few numbers out."

As well as the musical bash, the 35-year-old beauty treated Lila to a lavish diamond necklace.

Kate's eagerness to squeeze in some singing practice could be because she's performing at Simon Cowell's 50th birthday party tomorrow (03.10.09).

The model - who has been friends with the music mogul for several years - is determined to impress the 400 celebrity guests and performers when performs a version of Ella Fitzgerald's 'Summertime'.

A source said: "She is a keen singer and is taking her role in proceedings extremely seriously. As well as getting a few tips off rocker boyfriend, Jamie Hince, she's been practising her scales and gargling with lemon and honey. She once read that this is what Mariah Carey does ahead of each performance. Kate's word perfect on her chosen track."

Stars including Leona Lewis, Alexandra Burke, Jennifer Lopez and Il Divo are also set to perform and it has been rumoured pop superstar Mariah Carey will serenade Simon on the night.

Tomorrow's lavish bash, which is rumoured to have cost £250,000, is due to take place at Hertfordshire's Wrotham Park in celebration of Simon's landmark anniversary on Wednesday (07.10.09).