Christina Aguilera's Boyfriend Matt Rutler "Happy" With Her Curvier Shape

Still going strong!

When Christina Aguilera, 31, started dating Burlesque set assistant Matthew Rutler in late 2010, "we thought it was going to be a quick, seat-of-your-pants romance," a Rutler source admits to Us Weekly.

But more than a year later, "it's turned into something special," the source shares. Credit that staying power to Rutler's eagerness to please his girlfriend of over a year--especially when it comes to the Voice coach's son, Max, 4. (Aguilera split from Max's dad, her ex-husband Jordan Bratman, in 2010).

"He recently surprised them by taking them to Cirque du Soleil's Iris show," a pal says of Rutler. "They had a blast." More recently, Aguilera threw Rutler a 27th birthday bash at burlesque-themed hotspot Le Descarga in Los Angeles April 5.

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- US Weekly