Rihanna may have turned down Donald Trump's $500,000 offer to perform at a cancer fundraiser, but she did it for a greedy good cause. The Bajan singer celebrated her 23rd birthday this past Sunday and although she used the bronchitis thing as her excuse for rejecting Trump, she managed to take over Sunday's NBA All-Star Game halftime show with Drizzy and Yeezy and party hard at a secret location shortly after. RiRi celebrated her 23rd birthday bash at a Nivea USA-sponsored event and the skin and body care brand threw up pictures from the celebration on their Facebook page.