Lily Allen was "shocked" by how pregnancy affected her friendships.

The 28-year-old singer has daughters Ethel and Marnie with husband Sam Cooper, who she married in June 2011.

Prior to becoming a parent Lily was known for her wild lifestyle and party antics. When unable to do these, the musician noticed a change in those close to her.

"It was obvious that some people I thought were my friends were not my friends. Because they knew I couldn't smoke, drink or take drugs I wasn't interesting to them anymore. I was quite shocked, actually," she recalled to British magazine Q. "I'd always been part of the naughty crowd and when you get pregnant and can't be part of the naughty crowd any more it's like, 'Who are my friends?' That was quite scary. And isolating."

It was thanks to Sam, who Lily has known she was 15, that she left her old ways behind and settled down. She now can't imagine life without him.

"Even though I've known him for a long time he sort of introduced me to myself. He forced me to face reality. Instead of joining in the party and drinking the free bar he said, 'I think I really love you and I want us to have a future together, but I can't do this because it's really self-destructive and these guys are *****, they're not your friends. Why not come and have a life with me?" she sighed.

"And thank God I did, because it's the first time in my life where I feel like if I've had a really sh*t day I know exactly who to call: my soulmate. I've never, ever felt as stable as I do now."