Todd Williamson/WireImage
May 26, 2011 02:35 PM

Talk about a whirlwind!

After getting engaged on May 18, Kim Kardashian and Kris Humphries touched down in Monaco on Thursday for a planned family vacation with the basketball star and his family.

“I wanted to propose before the trip so we could really spend some quality time together with my family as a couple,” Humphries, 26, tells PEOPLE. “I planned it out this way.”

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Adds Kardashian: “We’re celebrating on a family vacation with them.”

The couple, who plan to marry this summer, will spend quality time together before Humphries begins his fall basketball season.

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