Leonardo DiCaprio's rumored girlfriend Rihanna debuted her new single "American Oxygen." But before she performed her latest music offering, the "We Found Love" singer slammed Indiana's Anti-Gay Law.

According to E! Online, fans who went to the March Madness Music Fest last Saturday were treated with the debut of Rihanna's new single "American Oxygen."

The pop singer, who is being linked to "Wolf of Wall Street" actor and producer Leonardo DiCaprio, performed "American Oxygen" from start to finish, much to the delight of her adoring fans.

Her song, which was only heard in snippets in commercials before Rihanna's debut of her new single, starts with the line, "Breathe out, breathe in / This American oxygen."

The Barbados native also belted her song with the lyrics, "Every breath I breathe / Chasing this American dream / Respect for a nickel and dime / Turn it into an empire."

It seemed like Chris Brown's ex girlfriend enjoyed her performance as she took to Twitter to express her joy.

Rihanna said, "Thank you Indiana!!! I would never forget how much fun I had with you tonight!"

Rihanna even added, "You blew me away!!! Thank you man!! One love always."

"And you SANG EVERY F--KING WORD!!! That s--t give me goosebumps!!!"

Rihanna's "American Oxygen" is part of Jay-Z's new membership-based streaming music service called Tidal, Access Hollywood said.

Apart from the "Diamond" singer's new single, Jay-Z's better half and pop diva, Beyonce, also debuted her track "Die With You" recently.

Meanwhile, after Rihanna's debut of her new single "American Oxygen," Leonardo DiCaprio's rumored girlfriend also took the opportunity during her performance to slam Indiana's controversial Religious Freedom Restoration Act.

In a video, which was uploaded via Facebook, the "We Found Love" singer was seen telling the crowd, "Who's feeling these new bulls--t laws that they're trying to pass over here? I say f--k that s-t."

She was also heard saying, "We're just living our mother--king lives, Indiana."

Rihanna is just one of the Hollywood celebrities who slammed Indiana's Religious Freedom Restoration Act.

Celebrities including Andy Cohen, Samantha Ronson, Dustin Lance Black, George Takei, and even "Wrecking Ball" hit maker Miley Cyrus also said their piece against the act.