Khloe's sister and her bestie walk in together.
Khloe's sister makes her entrance.
Khloe's mom and her beau arrive.
The Beauty & Essex restaurant awaits the guests' arrival.
Khloe and Tristan strike a pose in front of a special display by Balloon Celebrations.
Tristan poses with Khloe's sister and friend.
Tristan and Khloe pose with their moms.
Tristan and his guests pose for a group pic.
The couple, who are expecting their first child together, pose for pics.
Tristan thanks his guests.
Tristan is presented with his birthday cake.
The birthday boy blows out his candles.
The reality star and her beau strike a pose.