The singer performed "Die in California" with Machine Gun Kelly at Madison Square Garden in New York City Tuesday night while his father remained hospitalized in Los Angeles.
Photos of the chaotic scene captured Barker's unmistakable skull tattoo on his right hand and only the back of Kardashian, who had her hoodie up over her head.
The reality star showed off her slim figure in a tight tank dress as she celebrated her 38th birthday with family at Kris Jenner's new mansion.
"By the way, still can’t do it," the "Keeping Up With the Kardashians" star commented on a throwback video of herself attempting to style her strands.
Jessica Simpson's daughter Maxwell, Kourtney Kardashian's daughter, Penelope, and more party guests enjoyed a ride on Kim Air to "Camp North."
Kardashian celebrated her birthday with a lavish dinner party thrown by her mom. Guests included Kim, Kourtney and Rob Kardashian.
The supermodel, 26, and the NBA star, 25, spent some quality time together at Soho House in Malibu, Calif., on Sunday amid reports they called it quits.
The Good American founder showed off two Instagram videos of her posing in one of the brand's sexy bikinis, showing off her toned physique.
The model returned the favor, reacting to an Instagram photo of the athlete playing baseball after news broke that their two-year relationship is over.
The "Keeping Up With the Kardashians" alum bared it all in her latest Instagram post, which showed her sunbathing in the nude amid her recent breakup.