Siblings and co-founders of Rebel Yell clothing, Daniel and Andi Ballard, celebrated the addition of their new business partner, Guy Oseary, with a party at Los Angeles boutique Kitson on Feb. 19. Oseary is also a partner at Maverick Records.

The store was packed to the gills with Rebel Yell’s Spring styles, including a faded red limited-edition T-shirt that the designers made for the event. It said: “Rebel Yell for Health.” All proceeds from the T-shirt’s sale are to be donated to the Elizabeth Glaser Pediatric AIDS Foundation. Rebel Yell’s quintessential California vintage washed tees have been spotted on tabloid-favorite celebrities such as Ashton Kutcher and his wife, Demi Moore, who turned out in Rebel Yell gear for the event. —Rhea Cortado