This Week's Best Celebrity TwitPics!

This week, new momma Hilary Duff celebrated her first Mother's Day by snuggling with her adorable 8-week-old son Luca.

A -- dare we say -- non-tanned Snooki showed off her growing baby belly while still rocking a whole lotta leopard print.

And can you guess which star celebrated her birthday by posting a pic of herself as a precocious 6-year-old?

Find out the answer by browsing the personal photos these celebs and Kim Kardashian, Selena Gomez, the "Glee" cast and more shared on Twitter this week!