Sergey Brin and Nicole Shanahan (left), who were thought to have started dating in 2015, walked down the red carpet together at the Breakthrough Awards in California on Sunday. Shanahan donned a glamorous gold dress over her baby bump as Brin placed a protective palm on her stomach while the cameras flashed. They rubbed shoulders with the likes of event sponsor Mark Zuckerberg and his wife Priscilla Chan (center) and actor Eddie Redmayne (right), who delivered a tribute to late astrophysicist Stephen Hawking (inset). To honor Professor Hawking's extraordinary life, the night was themed Look Up, based on a quote of his in which he urged people to 'be curious'. Original Article: http://www.dailymail.co.uk/news/article-6353707/Eddie-Redmayne-pays-tribute-Stephen-Hawking-Oscars-Science.html Original Video: http://www.dailymail.co.uk/video/news/video-1797100/Video-Sergey-Brin-Nicole-Shanahan-arrive-Breakthrough-Awards.html Daily Mail Facebook: http://facebook.com/dailymail Daily Mail IG: http://instagram.com/dailymail Daily Mail Snap: https://www.snapchat.com/discover/Daily-Mail/8392137033 Daily Mail Twitter: http://twitter.com/MailOnline Daily Mail Pinterest: http://pinterest.co.uk/dailymail Daily Mail Google+: https://plus.google.com/+DailyMail Get the free Daily Mail mobile app: http://dailymail.co.uk/mobile