CAMBRIDGE (CBS) -- Rapper Ja Rule is showing off his Harvard University education.

He shared a photo to Twitter of a completed certificate from the Harvard Business School online certification program for Entrepreneurship Essentials.

"This certificate program introduces a framework -- People, Opportunity, Context, Deal -- to evaluate opportunities, manage start-ups, and finance ventures," it reads.

The four-week program costs $1,050, according to Harvard's website.

Ja Rule is no stranger to the business world. He's taken up interest in the stock market and is currently launching his own app, a celebrity booking service called Iconn.