Kim Kardashian and Kris Humphries are celebrating their engagement with a family holiday in Monaco.

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The reality TV star and the basketball player announced their plans to marry earlier this week and they have now jetted out to the European nation to toast their news in style with Kris' parents and siblings.

Kris told People magazine: "I wanted to propose before the trip so we could really spend some quality time together with my family as a couple. I planned it out this way."

Kim added: "We're celebrating . on a family vacation with them."

During their trip, Kim and Kris - who have been dating for around six months - will make their first public appearance since the news broke by attending a star-studded party tomorrow night (27.05.11).

The couple will join the likes of Prince Albert of Monaco and his fiancee Charlene Wittstock, Jamie Foxx, Jason Statham and tennis star Boris Becker at the exclusive bash, which will be held at Le Meridien Beach Plaza Hotel.

The charity gala - called Amber Lounge Fashion - is where Formula One race car drivers model fashions on the catwalk, while Taio Cruz will perform his hit 'Break Your Heart'.