Fergie and her fiance Josh Duhamel have had a joint bachelor/bachelorette party last night (08.01.09).

The pair - who are set to tie the knot in a lavish ceremony in Los Angeles tomorrow (10.01.09) - partied with 75 friends at new Santa Monica club Dakota Lounge.

The couple decided to go against tradition and celebrate their upcoming wedding together so their friends could meet each other before the ceremony.

A source said: "They decided to have a joint bachelor and bachelorette party and have their friends mingle and get to know each other before the big day."

Guests cheered and applauded when the 33-year-old singer- dressed in a sequined black mini-dress - and the 36-year-old 'Transformers' star arrived at the candlelit party at 9pm.

Family and friends - including Fergie's Black Eyed Peas bandmate will.i.am - drank expensive champagne and ate Kobe beef, tuna tartare and shrimp skewers while they danced to 80s songs until 1am.

It was a perfect evening for the bride-and-groom-to-be.

The source said: "Josh and Fergie usually spend so much time away from each other, so they wanted to make this week special and spend as much time together as possible."