Courtney Love has lost an incredible 45 pounds in just four months.The former Hole singer showed off her new svelte figure in a tiny string bikini when she took a dip in the pool at Hawaiian holiday resort Kea Lani this week. A source told Us Weekly magazine: "She starting losing weight in December when she began drinking diet shakes and sticking to a strict healthy eating regime."She is cut out carbs and is eating fish, steamed vegetables and doing lots of yoga."She's feeling like a different person. Her goal is to lose 55 pounds altogether."Last week, the 42-year-old rocker was seen passionately kissing Bruce Willis while he celebrated his 52nd birthday at Sunset Boulevard's Roxy nightclub, in Los Angeles. A source said: "They were full-on making out!"However, Courtney's representative insists the kiss was nothing more than a friendly embrace. He said: "Courtney was just giving Bruce a quick hello and then they went their separate ways."