Article continues below advertisementSun's out, buns out!Hailey Bieber was clearly feeling comfortable in her skin when she joined pal Kendall Jenner to celebrate her 30th birthday with a beach trip.On Thursday, November 6, the mom-of-one uploaded numerous photos from the outing, posing in a few bikinis while letting loose.Article continues below advertisementHailey Bieber's Bikini PhotosSource: @haileybieber/instagramHailey Bieber posted numerous bikini photos from Kendall Jenner's birthday trip.