British rapper Professor Green celebrated his recent proposal to Millie Mackintosh by hosting an engagement party in London on Friday night (12Apr13). The I Need You Tonight hitmaker popped the question to reality TV socialite Mackintosh in Paris, France last month (Mar13), and the couple wasted no time in holding a bash to mark their impending nuptials. They invited their pals to join them for a party at the U.K. capital's Groucho hotspot, and stars including hip-hop duo Rizzle Kicks and Scottish singer Emeli Sande attended the celebration. The rapper took to his Twitter.com page after the bash to write, "Love to everyone who made this night so special... Couldn't have asked for a better turn out... Thank you!"