Kate Moss is comforting Kelly Osbourne through her break-up.

The British supermodel is said to have been on the phone "day and night" to the 25-year-old presenter, who ended her engagement with Luke Worrall following the model's alleged infidelity with an unknown woman, and hopes she will "bounce back" quickly from the setback.

A source told the Daily Star newspaper: "Kate's been on the phone day and night giving Kelly crucial advice as well as a shoulder to cry on.

"Kate told Kelly to get away for a few days, recharge then get slim and sexy by hitting the gym.

"She's assuring Kelly everything will be OK. Kate knows Kelly will bounce back but feels sad to see her mate so let down by the man she wanted to marry."

Kelly recently revealed she was having one of the worst weeks in her life when she discovered not only had Luke been cheating on her but her new puppy had died.

She wrote on twitter: "My life just could not get any worst right now I come home to find my dog woody is dead. (sic)"

The 25-year-old star also confessed she would not "bash" Luke for their break-up, and instead was more angry at "sl**ty girls" for ruining her relationship.

She said: "At first I wanted to tell everyone everything and completely bash him because I'm hurt and angry. But at the end of the day, the truth is I did love Luke and that's all that matters.

"I kept up my side of the bargain and kept my side of the street clean, and no amount of male stupidity and no number of sl**ty girls are going to change that."