OLBG (OnLine Betting Guide), a sports-betting platform based in the U.K., has published a list called "Celebrity Entrepreneurs With the Biggest Fortunes." Billionaires JAY-Z and Rihanna lead the music moguls.

Hova's holdings are now valued at more than $2b, with investments in Roc Nation, Tidal, Armand de Brignac Champagne and D'Usse cognac, among other ventures. RiRi's Fenty empire affords the Super Bowl halftime headliner a portfolio valuation of $1.4b.

Other notable music names include Diddy (Combs Enterprises, $855m), Bono (Elevation Partners, $700m), Simon Cowell (Syco Entertainment, $600m), Beyoncé (22 Days Nutrition/Parkwood Entertainment, $500m), Dr. Dre (Beats, $500m) and Justin Timberlake (William Rast, $250m).

Is it too late to start a HITS weed enterprise? Check out the full OLBG list here (scroll down for the music peeps).