It may have been a busy weekend for superstar couple Jay-Z and Beyonce, but it seems Jay-Z is gearing up for another big night tonight at SXSW.

Rumors are circulating that another Hip-Hop heavyweight will take the stage tonight with Jay-Z and it will be none other than Eminem!

Jay-Z and Beyonce spent an event filled weekend together, helping Robin Thicke celebrate his thirty-fifth birthday at Catch along with Russell Simmons, Andre Harrell, Chris Burch and Cameron and Tyler Winklevoss, where the main topic at the table was parenthood. On Sunday, the superstar couple attended the concert of friend and music producer/artist The Dream.

Tonight Jay-Z is set to take the stage in Austin, TX and concertgoers may get a chance to see Eminem perform if the rumors are true. Jay-Z is letting his fans request songs they want him to perform on American Express' Twitter page with the hashtags #JAYZSyncShow and #Song.

The last time Jay-Z and Eminem performed together was in 2010 when they had the Home and Home shows. There were four shows in total, two in Detroit and two in New York.

Jay-Z's performance will be live streamed at 8 p.m. tonight on Youtube. You can view the live stream by visiting, http://www.youtube.com/user/AmericanExpress?feature=watch. The show will also be available on American Express' Twitter page, YouTube channel, XBOX Live and VEVO mobile and tablet platforms and in Austin the show will be streamed from a digital billboard on 6th Street and Red River.

The SXSW Music Conference takes place from March 1-18 and the lineup includes Bruce Springsteen, Fiona Apple, Mumford & Sons, Norah Jones, T.I., Wale, Lana Del Rey, Meek Mill, B.o.B. among many others.