Lily Allen leans back Kiss new boyfriend for a passionate clinch

Lily Allen and her down-to-earth boyfriend looked head-over-heels for each other last night as they kissed passionately in public.

The singer and builder boyfriend Sam Cooper locked lips at a London party and cuddled up together a balcony, seemingly oblivious to all around them.

The 24-year-old had taken her new man to the Diesel: U Music World Tour Party held at P3 in the University of Westminster.

Loved up: Lily Allen leans back for a kiss with boyfriend Sam Cooper at the Diesel: U Music World Tour Party at the University of Westminster, London, last night

Watching The Big Pink playing, she lent back to throw herself into a kiss with Sam, and danced around as she listened to the music. But she was never far from his side.

Dressed in a black tunic dress and carrying one of her beloved Chanel quilted handbags, Lily also stopped in at Home House for a party with Kate Moss, Sadie Frost and celebrity hairdresser James Brown.

Lily Allen debuted her boyfriend on the red carpet at the GQ Awards last month, but the pair have been spotted hand-in-hand over the summer months.

And The Fear singer has even stopped spending so much time on her beloved Twitter account after her constant twittering on her Blackberry drove him 'insane'.

Relaxed: The singer dances around, while Sam holds his arms protectively around her while they listen to The Big Pink on stage

Her close friend Jamie Winstone, 24, who is dating Lily's younger brother Alfie, was also at the party. She wore her peroxide blonde hair in a high-top ponytail, large earrings and a striped T-shirt dress.

Amber Le Bon, the model daughter of Duran Duran's Simon Le Bon and wife Yasmine, was also at the event.

Lily is releasing a climate change campaign track with the 80s group, a re-recording of Midnight Oil's Beds are Burning, along with other artists such as Bob Geldof, Mark Ronson and Fergie.