Khloé also made sure to document the multiple bouquets of flowers she'd received ... with some of the kids in front of some "Happy Birthday Khloé" balloons, while further videos captured ...

Justin, for his part, wore all-black and sang into a microphone as the duo sat in front of a trio of “Happy Birthday” balloons. Hailey captioned her upload, “31 ️‍ .” Justin and ...

Pink birthday balloons are tied to her chair ... In one video, the toddlers can be heard saying “Happy birthday” to their mom as they check out the flowers on the private jet.