EMMA GRIFFITHS and MATT WILLIS

British pop/rocker Willis, 25, was recently released from a substance abuse clinic, where he had been seeking help to kick his drink and drug addictions.

The couple exchanged nuptials in a civil ceremony at Rushton Hall in Northamptonshire, England - with Willis' pal David Gest as his best man.

Music mogul Gest and Willis became firm friends after competing on

U.K. reality TV show I'm A Celebrity... Get Me Out of Here! in 2006, which Willis went on to win.

Source: WENN