Singer-songwriter Kelly Clarkson has filed for divorce from her husband of seven years, Brandon Blackstock. The 38-year-old singer filed for divorce on June 4 and cited “irreconcilable differences” as the reason for their split, according to a website. In the court documents, Clarkson is requesting joint legal and physical custody of their children. The documents also say that the couple had a prenuptial agreement. Clarkson and Blackstock, 43, had tied the knot in October 2013. The couple share two children — five-year-old daughter River Rose and four-year-old son Remington Alexander. Blackstock also has two children from a previous marriage. (PTI)