1/8
Albert Michael/startraksphoto.com
Costume Required
Yee-haw! Kylie, Kourtney, Kris, Kendall and Mason are all geared up for the little guy's Western-themed 2nd birthday bash.
2/8
Albert Michael/startraksphoto.com
Giddy Up
The best part of the party, we're betting? The pony ride with grandma Kris Jenner, natch!
3/8
Albert Michael/startraksphoto.com
Make a Wish
A pregnant Kourtney lends her son a hand as they blow out the candles on his awesome cowboy-hat-shaped B-day cake.
4/8
Albert Michael/startraksphoto.com
Kiss, Kiss!
Uncle Rob shares a sweet kiss with his nephew. All together now: awww.
5/8
Albert Michael/startraksphoto.com
Say Cheese
Kourtney, Scott and their now-2-year-old son sit for a family portrait to mark Mason's milestone.
6/8
Albert Michael/startraksphoto.com
Icing on the Cake
The birthday boy gets to have his cake and eat it, too!
7/8
Albert Michael/startraksphoto.com
All About the Accessories
A children's birthday bash isn't complete without the cute paper party hats.
8/8
Albert Michael/startraksphoto.com
Color Him Happy
Mason works on tipi-decorating skills at the arts and crafts table with a little help from dad Scott Disick.