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Christina Aguilera, son Max and boyfriend Matthew Rutler made a trip to San Diego on Thursday, and the trio spent five hours at the Legoland park for Max's fourth birthday.

"Spent the day at Legoland with the love of my life," Xtina tweeted. "Happy bday Max!" After driving bumper cars and exploring the amusement park, Max was presented with a Lego-themed vanilla cake, and the trio also celebrated at the Hard Rock hotel.

The Grammy winner tweeted this pic of one of their adventures, and it seems like the two had a blast:

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