Justin Timberlake might have given a surprise performance at the Grammys on February 8 but the real surprise was at the after party. While walking into the Belvedere IX soiree at Teddy's in the Roosevelt hotel in Hollywood with current girlfriend Jessica Biel, Justin was shocked to see his ex-flame Scarlett Johansson and her husband, Ryan Reynolds. "At first, it was a bit weird and you could tell Jessica felt a little awkward, but as they all started drinking and hanging out, it was cool," an onlooker tells In Touch. "By the end of the night, Justin and Ryan were laughing and the foursome were all sharing the same table." Justin and Scarlett dated briefly in January 2007 after she appeared as his love interest in the "What Goes Around… / …Comes Around" music video. Just weeks after he was with Scarlett, Justin stepped out with Jessica Biel, and the couple has been inseparable since.