The 24-year-old 'Rude Boy' singer, wearing a cerise pink prom dress, performed at the event and was joined by her mother. She posted a picture of the pair on Twitter, adding: "Mumz surprised me for #TIME100"
Rihanna also claimed that her mother had made a joke at the prestigious bash about her rumoured fling with Ashton Kutcher, adding: "Well....2nt consisted of us singing Bob Marley, drinkin Vintage Scotch, and my mum thinkin a joke abt Kutcher was appropriate!"
Other glittering guests also making the list included actress Tilda Swinton, Homeland star Claire Danes and US TV presenter and comedian Chelsea Handler.
