The tennis pro saw the diva perform at her and Lionel Richie's concert in Fort Lauderdale, Florida.
Serena Williams is very pregnant and on the move.
On Thursday night, the 35-year-old tennis pro showed up to see Mariah Carey perform in Fort Lauderdale, Florida, and greeted the singer backstage, along with her 6-year-old twins, Monroe and Moroccan.
"With the beautiful @serenawilliams backstage tonight," Carey captioned a pic of herself and her kids posing with Williams.
Carey opened for Lionel Richie at the concert, and Williams -- who went to the show with her mother, Oracene Price -- was sure to Snapchat her love for their performances. The mom-to-be thoroughly enjoyed seeing the 47-year-old diva crooning "We Belong Together," and had an all-out singalong when Richie hit the stage.
After the show, Carey and her adorable kids indulged in some sweets at the concert after-party at Miami Beach's Sugar Factory American Brasserie. Roc was all about that cotton candy, and we don't blame him!
Williams has been keeping busy in lead-up to the birth of her first child with fiance Alexis Ohanian. Last week, her friends threw her a '50s-themed baby shower, and they got all dressed up for the occasion.
Check out the epic themed soiree:
