Matt Barnes Says He Definitely Dated Rihanna: 'I'm Too Grown to Lie'

We began the week with the sordid tale of Rihanna and Matt Barnes’ Dategate, and despite RiRi’s wishes, we’re still talking about it as the week comes to a close.

For those keeping score at home: First, Barnes – or “sources” close to the NBA tough guy – told TMZ he’d…