The 49-year-old, who inherited an estate worth nearly £6.5billion, has begun a romance with the former mayor of Washington.
The relationship is said to have started as a friendship when Adrian joined the board of College Track, an education charity founded by Laurene, in February 2012. They first met at a conference in 2011 where they discussed school reforms.
Welcoming Adrian on board, Laurene described him as "one of our country's great advocates for education reform," adding that his "sense of urgency and record of accomplishment is unparalleled."
Adrian, who works for a venture capital firm in Silicon Valley, and Michelle, his wife of 15 years and mother of his three children, announced their separation in January. Their divorce has not yet been finalised.
Adrian, 42, and Laurene's relationship became a "budding romance" at around this time, sources told the Washington Post.
Laurene, a major philanthropist, married the Apple co-founder in 1991after they met at Stanford University. Her husband died of cancer at the age of 56 in October 2011.