Sarah Harding's breasts have shrunk.The Girls Aloud singer, who is the face of Ultimo underwear, has recentlylost weight but is fuming because most of it has come off her impressivechest.Sarah, 26, said: "My boobs are the first things to go when I lose weight,and it really upsets me. If I want to get a cleavage, I need to wear a goodbra."The 'Call the Shots' singer has also revealed her wild partying constantlyworries her mother.She added: "She gets upset when she sees the pictures and reads about me.She rings and gives me a hard time."I can't say that I'm not a binge drinker. I do go out, drink and getphotographed - but I'm not always as wasted as people think."Sarah recently claimed "only pussies go to rehab" and insisted stars likeLindsay Lohan and Britney Spears need to get a grip.The heavy-drinking star said: "Only pussies go to rehab. I'm a bit of ageezer-bird, but I don't drink pints."