It's been a hectic three months for Hailey Bieber and her husband, Justin, but the model hasn't lost a step when it comes to flaunting her abs and showcasing an impressive physique, despite only giving birth to her first child three months ago.

Hailey Bieber celebrated her 28th birthday in style on Friday night, surrounded by her friends as she wowed in an all-black get-up. See details.

Hailey Bieber toasted to her 28th birthday in style with a “28-tini” celebration that showcased her love for martinis.

In lieu of a traditional going-out top, Bieber took a page out of Kendall Jenner's recent playbook by wearing her jacket as a shirt. However, unlike Jenner's tailored croc blazer, Bieber chose a thick (possibly faux) fur-lined jacket with a certain Death Becomes Her je ne sais quoi.

To the surprise of no one, Hailey Bieber undoubtedly knows how to dress for a party. On Friday, Nov. 22, the model and new mom celebrated her 28th birthday in style, wearing an opulent feather top that also harkened back to her boundary-pushing maternity style.