The sighting sparked rumors Rose, 33, and Khalifa, 29, are back together.
The pair's public display of affection reportedly repeated itself the following day when Rose and Khalifa hit the red carpet at the Grammys together around 9PM. This time, however, their hand-holding and kissing was caught on camera.
Rose rocked a form-fitting pink and red silk dress, while Khalifa wore a black suit featuring an unbuttoned white dress shirt. Rose also noticeably kept one arm around the rapper's waist at points throughout the night.
During the awards show, Rose reportedly danced and sang to a couple live performances -- including "Poison" and Mary J. Blige's two-song set -- as Khalifa had one of his arms wrapped around her waist. The pair was in sync and too close for just a friendship.
The couple split in September 2014 after a little over a year of marriage.
Prior to this alleged reunion, Rose dated Chmerkovskiy for five months. Although reports circulated in recent weeks the couple was getting serious romantically, Chmerkovskiy confirmed their split on Instagram Sunday,
"We decided to end our relationship a week ago, and did so with humility and understanding. She's an amazing woman and I feel very lucky to have gotten to know and love. An amazing mother, an awesome friend, a loving human period. Reserved, poised, and loyal... We both lead very different lives and unfortunately it didn't work out between us," the pro dancer wrote.
"I will continue to support her, praise her, and defend her against any narrow minded individual that dares to question her integrity as a woman, a friend, and most importantly the INCREDIBLE MOTHER THAT SHE IS TO HER SON! It's hard to do it all by yourself especially while the world stares and judges... but she does. Every single day... And for that alone I'll always have her back."
On Friday, a source told Us that Rose and Chmerkovskiy had called it quits on their relationship.
"Val has been on tour and really hasn't had time to see her too much. It fizzled out, but it wasn't serious to begin with," the source said. "I could see them hooking up again in the future."