From Lindsay Lohan "helping" Ungaro to Hayden Panettiere guest-designing for Dooney & Burke, high-profile partnerships between celebrities and fashion designers have become the trend du jour. Almost every week, a new star adds "fashion designer" to her resume by teaming up with an established design house and releasing a collection.

This week, Elle Magazine highlighted the latest celebrity/design house collaboration -- this one between British pop tart Lily Allen and high-end fashion powerhouse Chanel led by style icon Karl Lagerfeld (more here). While we like this particular pairing (charming-yet-outrageous singer meets stylish grandpa!), we can't help but remember past star/designer unions. Some were fabulous ... and some were, well ... Here, we take a quick look back.