Klitschko, 37, said that due to the political unrest in in Ukraine, which is home country of Klitschko, his wedding to Hayden been put on hold, reported Contactmusic.
"With the circumstances right now, it's hard for us to set a date," Klitschko said.
Hayden first got into a relationship with Klitschko in 2009 only to split in 2011. The actress revealed in April 2013 that she and Klitschko had got back together. They got engaged in October.