Three months looks good on you, Lennox!

Amy Davidson took to Instagram on Thursday, June 2 to share a sweet new photo of her baby son — and he's just getting cuter and cuter by the day!

"Hey guess what?! I'm three-months-old! High five!" the 8 Simple Rules star captioned the snapshot of Lennox adorably posing in his three-month-old onesie.

RELATED: You HAVE to Watch This Adorable Video of Amy Davidson's Baby Son Lennox!

The 36-year-old actress and her husband, Kacy Lockwood — who married in 2010 — welcomed Lennox, their first child, in March 2016.

Click through the gallery below to see more of Hollywood's cutest babies!