Mariah Carey appeared on Jimmy Kimmel Live on Monday to sing a medley of "Vision of Love" and "Infinity" to promote her new album #1 to Infinity, and she showed off her killer curves in a sparkly mini dress. Hot mama!

Before performing "Vision of Love," Mariah said to the crowd "I don't know if you know this one ... It's my first number-one single." Mimi nailed it, and though this was a repeat of her Billboard Music Awards set, one person who was not all about it was Jennifer Lopez!

During the BBMAs, J. Lo was caught on camera scrolling through her phone, rather than watching the pop diva's set. Both of the ladies are stars in their own right, but Mariah was definitely ruling the pop charts while J. Lo was still a backup dancer ... maybe Jenny from the block should show a little bit more respect?