RadarOnline.com has exclusively learned Pitt, 54, and the 42-year-old MIT professor are heading to Europe together this summer.
"Neri is planning a vacation with Brad after this semester is finished," a source close to the stunning Massachusetts-based brunette said. "She has been on cloud nine!"
"The two were trying to keep their romance under wraps, but Brad is not concerned with being discreet about it anymore," added the source.
As Radar previously reported, after the pair were spotted numerous times together on the MIT campus, a source revealed that Pitt and Oxman have been "practically living together" for almost a month in her luxury condo in Cambridge.
"Brad already has the keys to her apartment and they are getting very serious," a source told Radar.
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