Beyonce and Jay Z weren't only in attendance for Lebron James' marriage to Savannah Brinson over the weekend. The hip-hop/R&B power couple also threw down during the reception.

According to TMZ, Hov and Bey performed their 2003 hit single 'Crazy In Love,' which stems from the latter's debut album, 'Dangerously in Love.' While footage of the performance hasn't hit the web just yet, we're crossing our fingers that someone had their cellphone ready for the occasion. Someone had to be filming this, right?

The ceremony was held in San Diego, Calif. at the Grand Del Mar Hotel on Saturday (Sept. 14) night. It also took place in the middle of two of Beyonce's Brazilian tour dates. The previous night she was performing in Rio De Janeiro and then, on Sunday, she was already back to take the stage in Sao Paolo.

You can watch the 'Crazy in Love' video below.