A representative for the actress, who plays Santana Lopez in Glee, confirmed the happy news on Friday morning (4 October), just hours after a glowing Naya flashed her engagement ring on the red carpet at Latina Magazine's Hollywood Hot List party in LA.
Naya and Big Sean are thought to have been dating for around six months.
The couple made their first public appearance together in April, when they cuddled up on the red carpet at the 42 premiere in Los Angeles.
Rumours of a romance had been fuelled earlier that week when they were seen attending a Rihanna concert together at the Staples Centre. Prior to that, fans noted that Naya had sent Big Sean a birthday message in March.
They initially connected via Twitter, with Big Sean telling E! News: "I DM-ed her. We need to do a commercial for Match.com. Social networks!"
In the same interview he admitted to waking up every morning, looking over at Naya and thinking: "I'm winning hard."
Congrats to Naya and Sean!
Last month, the gorgeous couple teamed up for a sexy photoshoot with Terry Richardson, which saw Naya flashing her incredible figure in a very, very cropped top and teeny tiny denim shorts. (Check out the pictures from Naya Rivera and Big Sean's sexy photoshoot here.)
Listen to Naya featuring on Big Sean's lyric video for 'Sorry' below:
More celebrity couples who are engaged below:
Copyright: Instagram Mark Wright