Joining Kim for the launch of Kardashian Kollection for Sears, Kourtney ties together her frilly nude lace ensemble with black T-strap patent pumps.
06/22/2011 AT 05:00 PM EDT
Meanwhile, Kim's big sister Kourtney Kardashian joined boyfriend Scott Disick, son Mason and another couple for a poolside lunch at the Beverly Hills Hotel. The reality pair sipped on iced teas and dined on the hotel's McCarthy salad, but briefly had to rearrange seats when Mason was moved to a highchair. "Once he was away from Kourtney, he started to get fussy and only calmed down again when [she] switched seats and sat next to him again," a source tells PEOPLE.