On Friday Kourtney Kardashian hit the beach with her darling daughter Penelope, and the duo were joined by Courtenay Semel and several other lady friends. Girls' day out in the 'Bu!

Kourtney and Courtenay (seriously, does anyone spell it the traditional way anymore?) have been BFFs for a long time ... we always forget that! Which reminds us, Kourtney and Courtenay (along with Kim's bestie Brittny Gastineau) starred on Filthy Rich: Cattle Drive waaaay back before the Kardashian family started taking over the world. Kinda funny how far they've come! Well, Kourt, anyway...