"Spent the day at Legoland with the love of my life," tweeted Christina Aguilera last Thursday. "Happy bday Max!" 'The Voice' judge's wee one just turned four, and the proud mom took him out to celebrate, along with boyfriend Matt Rutler and friends. Fun!

Before 'The Voice' starts up again (premiering right after the Super Bowl on Feb. 5), Xtina took time for her family at the Carlsbad, C.A. theme park, where they hit up the speedboats along with a few other rides and attractions. Chrissy may be getting glamourous for Marie Claire's February 2012 issue, but last Thursday was all about her special little guy. What a fun, down-to-earth mom.

The wholesome fun is a far cry from the starlet's recent reports of booze-infused nights out. We're so glad to see her having fun with her adorable little man!

The curvy singer is showing her fans, and her haters, how important it is to be happy and healthy. Recently, she told People Magazine just how lucky she is to have her health, her awesome boyfriend, and her wonderful son. With star power and positivity, Baby Jane just seems invincible these days. Although make no mistake -- if her rumored new single is any indication, Xtina still knows how to get 'Dirrty!'