Demi Lovato sure knows how to get married in style ... In a tender tribute to eternal love, John Rzeznik of the Goo Goo Dolls performed the band’s hit song “Iris” for the couple’s first dance, echoing ...

Demi stunned in two custom Vivienne Westwood gowns; was serenaded for the first dance by the Goo Goo Dolls’ own John Rzeznik — which she deemed a “pinch-us moment” — and enlisted friend ...

Interestingly, she also gave a performance on Wednesday's viral dance from season 1 on the song Goo Goo Muck from The Cramps. In the second season, Gaga will play the role of Rosaline Rotwood.