Other stars that preformed at LA's Intuit Dome and Kia Forum included Lady Gaga ... as a backup vocalist for the band. Gwen's brother, keyboardist Eric Stefani, was also part of No Doubt ...

And so FireAid – billed as “an evening of music and solidarity” – saw performances from a dizzying ... from one of the all-time greats. Gwen Stefani performing at FireAid Credit: REUTERS ...