This put an end to speculation that all is not normal among all the coalition partners in the government led by Prime Minister Shahbaz Sharif.
Bilawal, 33, the front-runner for the post of Foreign Minister in Pakistan, was not sworn in on Tuesday, fueling speculation that he was not interested in joining the new government.
Earlier, Information Minister Maryam Aurangzeb had assured that the PPP president would take oath after returning to Pakistan. Kaira said that Bilawal has left for Pakistan after meeting Nawaz. Bilawal is the son of former Prime Minister of Pakistan Benazir Bhutto and former President Asif Ali Zardari. PPP is the second largest party in terms of numerical strength in the current Shahbaz Sharif government of Pakistan.