Kim Kardashian slipped into something more comfortable after she celebrated her 43rd birthday over the weekend.

The SKIMS founder transitioned effortlessly from the long red gown she wore to her birthday party to three different loungewear looks from her company.

The mom of four took the selfies in her enormous, monochromatic bathroom.

The first look consisted of a light grey bralette with matching soft, loose pants and a matching jacket which fell off her shoulders and gathered on her arms.

In all the looks, The Kardashian’s star was barefoot with her raven hair falling straight down her back.

Comfy: Kim Kardashian slipped into something more comfortable after she celebrated her 43rd birthday over the weekend

Sleep wear: The SKIMS founder transitioned effortlessly from the long red gown she wore to her birthday party to three different loungewear looks from her company

Kim’s abs looked sculpted to perfection in the bralette.

The second look featured a cropped, ribbed henley-style, long-sleeved pale grey top with five buttons on the front.

She paired that top with a pair of short boxer-brief style bottoms that clung to the curves of her famous hips and backside.

The Keeping Up With the Kardashians alum held her phone in front of her face which highlighted her talon-like pointy nails and manicure.

In the third and final look, the reality TV star put on a black, one-piece garment.

The darker loungewear had a plunging neckline that perfectly complimented her cleavage.

The one-piece ended in shorts that showed off her toned and tan legs.

The comfy looking loungewear is available from SKIMS now.

Henley top: The second look featured a cropped, ribbed henley-style, long-sleeved pale grey top with five buttons on the front

Cozy: She paired that top with a pair of short boxer-brief style bottoms that clung to the curves of her famous hips and backside

One piece: In the third and final look, the reality TV star put on a black, one-piece garment

Available now: The darker loungewear had a plunging neckline that perfectly complimented her cleavage

Pink pedicure: The one-piece ended in shorts that showed off her toned and tan legs

On Friday, the beauty celebrated her birthday at the swanky Beverly Hills restaurant Funke.

Kim was joined at the soiree by her sisters Khloé Kardashian, Kendall Jenner, Kylie Jenner and their mom Kris Jenner.

It was also attended by the family’s close friend and Kendall’s BFF Hailey Bieber and Kim’s close pal Lauren Sanchez, who is the fiancée of billionaire Jeff Bezos.

Ivanka Trump and Sofia Vergara also attended Kim’s party.