Kim Kardashian celebrated her actress pal's Natalie Halcro's 34th birthday with a pajama party aboard a private jet.

"Pajama Party on the PJ for @nataliehalcro's birthday!!!!," Kardashian, 41, tweeted Tuesday afternoon, accompanied photographs of herself, Halcro, and Olivia Pearson dressed in pink SKIMS pyjamas while flying. "I adore you, Nat! Definitely a member of the ride or die club."

Kim Kardashian, Olivia Pierson and Natalie Halcro.
Kardashian (L) deemed Halcro (R) a member of the "ride or die club."
kimkardashian/Instagram

"Def a member!!," Khloé Kardashian agreed within the comment section, later adding, "This is the cutest!!!"

Pearson, Halcro's cousin, added within the comments of their photo, "PJ's on the PJ ✈ HAPPY BIRTHDAY NAT 🎂✨💕."

Kim Kardashian, Olivia Pierson and Natalie Halcro.
Pearson (center) also wished her cousin Halcro (R) a happy birthday.
kimkardashian/Instagram

Kardashian appears to be returning from vacation with the pair, sharing snaps of the trio Saturday night hanging out poolside alongside the caption, "🌑 Moon Manifestations 🌑," with the full moon featured prominently in the background.

Pearson captioned the same pics on her Instagram account, "Girl chat & moon manifesting 🌚✨."

Kim Kardashian, Olivia Pierson and Natalie Halcro.
Kardashian shared this photo of the trio Saturday night alongside the caption, "🌑 Moon Manifestations 🌑."
kimkardashian/Instagram

The "Keeping Up With the Kardashians" star shared several sexy shots from the getaway, including a collection of the beauty oiled up in a barely-there pink bikini.

"still spamming vacay pics," she captioned the sizzling snaps, with friend La La Anthony writing in the comments, "Yesterday u said I wasn't playing fair so what do u call this today Kimberly?? 😂🔥😍😍😍😍😍🔥🔥😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍.