Madonna has hired more than 400 bodyguards after receiving death threats from Balkan fanatics, who worked to keep her from performing her Sticky & Sweet Concert in front of 30,000 fans in Belgrade, Serbia on Monday night.

The controversial Material Mama arrived in disguise and surrounded by a posse of burly bodyguards after receiving threatening messages ahead of her first performance in the Serbian capital, The Daily Star reports.

Madonna has been left so shaken by the death threats, she’s decided to pay the guards to accompany her to neighboring Romania, where she is set to play later this evening.

Her rep Liz Rosenberg has declined to comment further on the nature of the threats.