Maci Bookout's Instagram

Maci Bookout's Son Bentley Just Celebrated An Exciting Milestone

Here's a hint: The kindergartner is due for a visit from a very special fairy.

Maci Bookout's son Bentley has been celebrating a series of firsts lately, including a grand slam and starting kindergarten. And now, the cute five-year-old is due a very special treat -- under his pillow from the tooth fairy.

Maci Bookout's Instagram

"Benny lost his first tooth at school today! FINALLY! #bigkid," his proud mama posted on Instagram, along with a snapshot of her kiddo showing off his dental situation -- down one pearly white. Pretty soon, his piggy bank will runneth over -- better get ready, Maci!

Bentley isn't the only "Teen Mom" child saying farewell to his former grin: Amber Portwood's mini-me Leah recently flashed her new toothless smile and resembled an adorable Jack-o'-lantern.

Be sure to stay tuned to MTV News for more updates on the return of Maci and Bentley!