Sia has agreed to pay ex Dan Bernad a hefty amount of child support following their divorce. According to court documents obtained by Us Weekly on Monday, April 6, the "Cheap Thrills" singer, 50, agreed to pay Bernad $42,500 per month for the care of 2-year-old son Somersault. The payments began on April 1 and will continue until Somersault turns 18. (Sia is also mother to two sons she adopted as teens in foster care.