"It's one of my girl's birthdays tomorrow...and when I say my 'girl,' I mean Demi Lovato," Clarkson said as the crowd cheered. "She's always been so supportive and so cool."
Clarkson has expressed her admiration for Lovato in the past.
"I love her. She's so sweet," she told MTV News in March. "Every time we see each other, she's always like, 'I like Kelly Clarkson,' she's always so nice, she's like my biggest fan and I love it. It's so awesome, we're both Texans."
"I was not planning on announcing this. I'm totally pregnant again," Kelly then admitted, while laughing. "That was not planned. I just didn't want you to think I was crazy. Honestly I'm just hormonal today. Nothing's wrong. I'm okay. I haven't vomited yet!"