06/29/2012 01:00 pm ET

Hilary Duff: Beach Time With Baby Luca (PHOTO)

Can Hilary Duff and baby Luca be any cuter?!

The new mom and her family are currently vacationing in Mexico -- we saw her relaxing in a bikini earlier this week -- and now Duff has taken to Twitter to show off her 3-month-old son.

Duff, who welcomed Luca Cruz on March 20 with husband Mike Comrie, hasn't been shy about showing off her bouncing baby boy on the social media site. She recently snapped a photo of a very upset Luca, writing, "He is cute when he's mad!"

In May, Duff opened up about motherhood and how it's affected her relationship with her own mom.

"It's wild being a mom now, and how you feel toward your mom afterward. It definitely changes," Duff told The Huffington Post. "So much just clicks. You're like, 'Oh I get it! I get why you told me "no" all those times. I get why you're so protective over me.' And it continues now, when I'm 24 and married. She still treats me like that."

Check out Hilary's adorable beach photo below:
Celebrity Kids: Out And About