Bill Clinton says his daughter Chelsea and son-in-law Marc Mezvinsky are trying for a baby, according to our spies. Sources attending the All Ireland Scholarship Awards at the University of Limerick — where Bill was a special guest Saturday — overheard Bubba telling a guest when asked if he and Hillary want to be grandparents that Chelsea and Mezvinsky “tell us they’re working on it.” When the spy asked if Hillary would run for president, he laughed, saying, “You’ll have to ask her.” The ex-prez reportedly picked up $250,000 for speaking at the event, where 125 students received scholarships and guests included Irish Finance Minister Michael Noonan, businessman JP McManus, rugby icons Keith Wood and Paul O’Connell and Michael Smurfit, owner of the tony K Club. Bubba arrived in Ireland on Friday and stayed at the luxe Adare Manor Hotel and Golf Resort, where guests have included Hugh Grant and John Travolta. Spies say he hit the links with pals Friday before his speech in front of 600 invite-only guests.