Watch: Chrissy Teigen Wishes Luna Happy 'Month Birthday'

08/23/2016 10:48 am EDT

Chrissy Teigen and John Legend's little Luna turned four months old on Sunday and that is reason enough to celebrate.

The dedicated mom posted a cute video of Luna lounging on the couch, smiling away as Teigen wishes her a happy birthday.

"4 months. Enjoy the month birthdays while you can, buttbutt!!" she wrote in the caption.

Always willing to poke some fun at herself and the silly sides of motherhood, the supermodel also wrote in letters across the video, "I now celebrate monthly birthdays I guess."

It's hard to believe it has only been four months since their adorable daughter was born!

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