New Delhi: Samajwadi Party chief Mulayam Singh Yadav was the star of UPA-II's third anniversary dinner on Tuesday. While the key ally Trinamool Congress seems to be drifting away from the UPA, Mulayam was seen sharing the stage and then the high table with Prime Minister Manmohan Singh and UPA Chairperson Sonia Gandhi at the dinner, an honour reserved only for close allies. The big question that arises now is if the Congress will dump Mamata Banerjee for Mulayam.