MundoNiSchiz0o

It's a good thing Pink and her husband Carey Hart have a sense of humor.

The singer, who acknowledges in an interview with Ellen DeGeneres airing Friday that she and her ex are a couple again, says she finds it funny to perform her hit song "So What" – which contains some choice words for Hart.

"He's in the audience so when I sing, 'He's a tool,' now that's my favorite line," she tells DeGeneres. "Hi, Honey, that's you."

When the talk show host offers her congratulations on being "happy" and "back together" after splitting up, Pink says, "We are. Thank you."

Pink and Hart got married in Costa Rica in January 2006 and announced their split two years later, but, "We didn't do the paperwork deal," says Pink.

Asked if she and the motocross racer would consider having another wedding ceremony, Pink says coyly, "I love a party."