Kanye & Jay-Z's UK Party Night with Kim, Rihanna & Gwyneth

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　　Kicking off their European tour run in the UK, Jay-Z and Kanye West unwound following a concert in London on Saturday night (May 19) by throwing a 'Watch The Throne' tour London show after party at DSTRKT.

　　As for the star-laden after party, Kanye turned up to DSTRKT with his black dress clad E! reality star girlfriend, Kim Kardashian, on his arm.

　　Enjoying being able to spend time with her man on the road, Kim tweeted a pic of two plates of gourmet food with shiny gold and silver utensils atop to go with a message reading, "Meal with my baby on the throne before the show!"

　　With Kim's brother Rob also turning up with his new lady, Rita Ora, other star power int he house at DSTRKT included Jay's Coldplay rocker pal Chris Martin, who was joined by his actress wife Gwyneth Paltrow and designer friend Stella McCartney.

　　Topping off the list of 'Watch the Throne partygoers was the always-gorgeous Rihanna, who certainly sounds as if she had an eventful evening - though she's having trouble remembering it.

Rihanna Joins Kanye West & Jay-Z On 'Watch the Throne' Tour

　　Joining in on one of the biggest acts this year, Rihanna made her way on stage for a surprise performance with Kanye West and Jay-Z for their "Watch the Throne" tour in London.

　　The Barbadian beauty took to the London O2 Arena on Sunday night (May 20) wearing a cropped black top, skinny jeans and a beanie to perform "All Of The Lights" with Kanye as well as joining in on Jay-Z's hit "Run This Town."

　　After leaving the arena, the 24-year-old took to her Twitter page to let her 19 million-plus followers in on her exciting night tweeting, "Rihanna NAVi made historih tonight as the first person to Watch The Throne AND join it!!! No one is allowed on that stage! Thank u guys."