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Remember when Paris Hilton's parents didn't like her boyfriend, Doug Reinhardt?

Her fam has apparently warmed to the frozen-burrito heir, because just last night, P. and Doug went on a double date with her parents for Kathy's birthday.

And because it was her mom's big night, Paris sweetly shared the spotlight as the paps outside Dan Tana's serenaded Kathy with a rendition of "Happy Birthday."

While Rick proudly told photogs that he and Kathy have been married for 30 years, it seems Paris and Doug may go the distance, too...

The couple just returned from a tropical vacay to paradise, which Paris twittered about nonstop.

Exotic trips are nothing new for this duo. Besides their recent jaunts to Sundance and Vegas, Doug whisked Paris away to a private island in Fiji after a brief breakup last year.

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See more stars out and about Tinseltown in Party Pics: Hollywood!