Ashlee Simpson in control

Ashlee Simpson has vowed never to go off the rails.

The singer - who recently announced her engagement to Fall Out Boy rocker Pete Wentz - won't follow in the footsteps of troubled stars Britney Spears and Lindsay Lohan because she is in control of her life.

She said: "I don't see myself ever following the path those girls take. I'm almost 24. I'm pretty together and I'm getting married. I wouldn't ever let myself get that way and I don't surround myself with yes-people. I think that's the most important thing.

"People don't control me or anything I do and I've never had that problem." Ashlee - whose older sister is pop singer Jessica - says her relationship with Pete helps keep her grounded. She added to Britain's Daily Star newspaper: "Pete is my support system. We definitely give honest opinions of each other. I love his music and he's so supportive of everything I do."

Meanwhile, Ashlee has revealed she loved working with producer Timbaland on her new single 'Outta My Head (Ay Ay Ay)'.

She said: "It was so cool to work with Timbaland but it was important for the end result not to sound like one of his tracks. He really got me and who I am as a person, so the music still has this rock element going on, but with an 80s sound.

"I'd never worked with anyone who'd done beats. But I was like, 'Ah, I really like this world.' And who better to go to than Timbaland. It was random but a very cool collaboration."