Many of the artists that played at Coachella's opening weekend last week are returning for the second part. But the thrill, as always, is in the surprises. And last night had a big one: Green Day's Billie Joe Armstrong joined the reunited Replacements onstage. Here are some of our favorite pics from the fest.

Neko Case

Katie Stratton, Getty Images
Katie Stratton, Getty Images

Dum Dum Girls

Kevin Winter, Getty Images
Kevin Winter, Getty Images

Bryan Ferry

Kevin Winter, Getty Images
Kevin Winter, Getty Images

Ellie Goulding

Christopher Polk, Getty Images
Christopher Polk, Getty Images

Haim

Kevin Winter, Getty Images
Kevin Winter, Getty Images

Outkast

Kevin Winter, Getty Images
Kevin Winter, Getty Images

The Replacements With Billie Joe Armstrong

Kevin Winter, Getty Images
Karl Walter, Getty Images