Rihanna Follows Up Joan Rivers Spat with a Retail Romp

Squeezing in a mini shopping session ahead of her week-ending work obligations, Rihanna was busy spending cash in West Hollywood on Friday (August 24.

Joined by a gal pal, the "We Found Love" songstress looked hot to trot in a brown tank top paired with a wee black skirt and sneakers as she hunted for a new outfit at Opening Ceremony before making her way to DreamWorks Studios.

RiRi's retail romp comes as she's been all over the headlines today thanks to a spat with Joan Rivers - who called her an "idiot" for still having feelings with her abusive R&B star ex, Chris Brown.

Not taking fondly to the talk show staple's criticism, 24-year-old Rihanna quickly fired back a fiery Twitter post reading: " @Joan_Rivers wow u really do get slow when you’re old huh?... Slap on some diapers.”

Never one to back down from a war of words, the outspoken Miss Rivers continued to preach to the Barbadian singer while also trying to bury the hatchet, as she wrote, "Honey, @Rihanna, everyone knows: If he hit you once, he’ll hit you again. Read the statistics. PS – Love to have you on Fashion Police!"

Enjoy the pictures of Rihanna doing some shopping in West Hollywood, California (August 24).