Kim Kardashian wants to be a UK size 10 (US size 4) for her first public appearance since giving birth.

The reality TV star - who welcomed her daughter North into the world two months ago with boyfriend Kanye West - has been working hard with a personal trainer in a bid to shed her post-pregnancy baby weight.

A source told yahoo.co.uk: ''Kim is totally focused on weight loss and has waited until now before real training, but has a new ripped personal trainer who comes to the house.''

The brunette beauty has ditched the larger clothes she sported throughout her pregnancy and has turned her hand to the Green Coffee Bean Pill, a popular fad diet, to aid her weight loss.

The source explained: ''She has completely ditched her pre-baby wardrobe for a new smaller set of clothes as she loses more weight, and has taken to using the Hollywood fad coffee bean extract pills to shed the pounds.

''She's desperate to be a size UK10-12, and has spoken to leading nutritionists in Hollywood, who said the fat-busting pills were known to be effective.''

Her mum and manager, Kris Jenner, thinks she still has ''a way to go'' before she reaches her target, but admits she's dropped some pounds since she started breastfeeding.

She said: ''As far as Kim's weight is concerned, she has a way to go. She lost quite a bit of weight initially when she first started breast feeding, but it's especially tough losing those extra baby pounds.

''She is still breast feeding and wants to continue for as long as she can.''