OutKast's recent reunion shows at Atlanta's Centennial Olympic Park featured a star-studded lineup but concertgoers were most surprised to see Erykah Badu hit the stage with her former significant other, André 3000, who affectionately refers to her as his "baby mama."

"That's my baby daddy!," Badu joked as she took the stage, as noted by Vibe.

"We joke a lot," he said of his relationship with the soulful singer. "People just don't know our personal life. We joke like that on the phone. She calls me her baby daddy and I call her my baby mama. It's funny to us now because it's such a talked-down type term. It is what it is. It's totally a punch line."

The two music-makers share a son, Seven.

"Our son is about to be 17 and he tells us, 'You guys are nuts,'" Three Stacks said. "Erykah and I are cool friends, man. We talk on the phone. She even asks my advice on relationships. She's like a cool sister more than anything. The first thing people would think about us is, 'Oh, they don't get along.' But there are always feelings when people grow apart. It's something you have to get through. But man, we are cool."

The rapper turned actor also revealed that Badu was originally supposed to perform with the duo at Coachella.

"She was supposed to come out to Coachella but the dates did not work out. So we already know that we wanted to find the time to bring out people that we knew during the tour, and I think the Atlanta show worked out."

In case you missed it, check out their performance of "Humble Mimble" after the jump.

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