Headed out for an evening of fun to celebrate their son's third birthday, Kourtney Kardashian and Scott Disick arrived at Serendipity's in Miami on Friday night (December 14).

The 33 year-old mom of two toted in her adorable new daughter, Penelope, while sister Khloe followed closely behind with the fashionable birthday boy in tow.

Getting ready for a fun-filled late night interview, Khloe Kardashian made an appearance on "The Tonight Show with Jay Leno" on Tuesday (December 4).

The "Keeping Up with the Kardashians" star looked elegant in a little black dress and sexy heels, which she accessorized with a pin-up inspired hairstyle.

Enjoying some fun in the sun, Khloe and Kourtney Kardashian hit the beach with Kourtney’s son, Mason, on Sunday (December 2) in Miami.

Dressed in star-flecked cropped jeans and a grey-and-tan baseball shirt, Khloe helped her young nephew gather a pail of sand to make a castle.