Big spender! Billionaire Elon Musk takes girlfriend Grimes on date-night in Malibu just hours after announcing plan to buy $25m of Tesla stockElon Musk, 47, and Grimes, 31, went public with their relationship in May 2018Pair were spotted walking hand-in-hand after date night at Nobu in MalibuComes as Tesla CEO announced he would buy $25million of stocks in company By Dianne Apen-sadler For Mailonline Published: 11:37 BST, 4 May 2019 | Updated: 11:42 BST, 4 May 2019 Elon Musk and his girlfriend Grimes were spotted enjoying a date night in Malibu – as the CEO announced he would buy $25million of Tesla stock.The 47-year-old billionaire kept his look casual, opting for a white button down shirt with a blazer and dark navy jeans for their dinner at Nobu.Grimes, who now goes by the name ‘c’, went public with her relationship with Musk in May 2018.They were seen walking hand-in-hand, with the 31-year-old musician covering her mitts with red fingerless gloves. Elon Musk and his girlfriend Grimes were spotted enjoying a date night in Malibu – as the CEO announced he would buy $25million of Tesla stock They were seen walking hand-in-hand, with the musician covering her mitts with red fingerless glovesGrimes, real name Claire Elise Boucher, wore a split khaki jumper with black stripes over a pair of black skinny jeans paired with stylish chunky boots.Keeping her pink locks covered with a black beret, the songstress was seen carrying a denim jacket covered in a graffiti print. Yesterday it was announced that the South Africa-born business tycoon would buy $25million of stocks – more than double his initial commitment.The electric car maker raised the size of its planned share offering to 3.1 million shares, priced at $243 apiece, on Friday. The 47-year-old billionaire kept his look casual, opting for a white button down shirt with a blazer and dark navy jeans for their dinner at NobuTesla had said on Thursday it would raise up to $2.3 billion in new capital through shares and debt, easing Wall Street concerns about the money-losing company’s ability to overcome a drop in sales and build new product lines. The company plan to issue shares and convertible debt comes after the company repeatedly pushed back forecasts for turning a profit.The company faces expensive challenges, including launching production in China, overhauling its U.S. retail and service operations and developing new models, including the high-volume Model Y SUV and a Semi commercial truck.