Beyoncé has been in 11-hour rehearsals in preparation for Coachella Festival. Sources say that Bey has been practicing at a high-profile studio in L.A. There are seven security guards at the studio, who are making sure only approved dancers, choreographers and technicians are allowed into the facility. Bey was supposed to perform at the festival last year, but had to back out due to her pregnancy with twins Rumi and Sir. She is headlining on April 14th and April 21st.