Lady Gaga likes to get wild on stage, but she showed a surprising softer side recently in LA with a new boyfriend, Matthew Williams, and a baby believed to be his son. "Matthew and Gaga have been dating for months," an insider says of the secret romance. "They were together on and off for more than a year, but called it off when mixing work and love became too difficult." Matthew, nicknamed "Dada" by the singer, then had a child with another woman, and Gaga began dating an entrepreneur named Speedy - but their feelings for each other never went away. "They spend all their time together, and travel everywhere, so it was bound to happen. Speedy dumped her, and Matthew left his girlfriend for Gaga," the insider says. Now they look like one happy family! "Dada" Williams is one of the chief collaborators in the Haus of Gaga, the team that designs most of Gaga's outrageous outfits.

For more on all the latest celebrity news, check out this week's issue of In Touch, on newsstands tomorrow!