Kendall and Kylie Jenner celebrate being new aunties while out having lunch with a gal pal at Health Nut restaurant on Monday (July 9) in Woodland Hills, Calif.

Yesterday morning, their big sis Kourtney Kardashian and her longtime boyfriend Scott Disick welcomed their second child – a baby girl named Penelope Scotland!

PHOTOS: Check out the latest pics of Kendall Jenner

“Great day!” Kendall tweeted. “#Babytime #PenelopeScotland.”

FYI: Kendall is wearing a Motel Rocks Robyn dress.

10+ pictures inside of Kendall and Kylie Jenner having lunch at Health Nut restaurant with a friend…