The blonde socialite shared several throwback posts in honor of her former bestie's 36th birthday yesterday, shouting out to her about all the good times they've shared.
"Happy Birthday @NicoleRichie," she wrote. "Looking thru all these photos brings back so many special & amazing memories! Just wanted to let you know that I am so happy for & proud of you. Such a beautiful family you have created & loving your new TV show @NBCGreatNews, so hilarious!"