Mumbai, June 20 : Bollywood megastar Shah Rukh Khan and wife Gauri Khan are due to have their third baby, this time a surrogate, in July, sources said. The star couple had been secretly planning their surrogate baby since last year during the shooting of Chennai Express. A source quoted a family friend of Shah Rukh as saying; "Gauri did not want to go through the whole trouble of pregnancy and risks at the age of 47." Hence, the two decided for surrogacy. The baby is due next month."Dr Feroza Parikh of Jaslok Hospital, Mumbai will be supervising the delivery of the surrogate baby. The star couple presently have a son Aryan, 16, and Suhana, 13.Though a media controversy was created that the star couple had allegedly carried out a sex determination test to establish that the surrogate baby was a boy, the couple has since denied the charge.