According to an Us source, separate white tents were set up in the mansion's backyard for the ceremony, dinner, dancing and more.
Iovine, the co-founder of Interscope Records and chairman of Interscope Geffen A&M, and Ross, the ex-wife of film director Rupert Sanders, began dating in February 2013 and got engaged in September of last year.
Ross was married to Sanders from 2002 until 2012, when he publicly admitted to having an affair with actress Kristen Stewart, his leading lady in Snow White and the Huntsman. Ross played a supporting role in the film her then-husband helmed.
Ross and Sanders, who have two children together, finalized their divorce in 2014. The cheating scandal also brought an end to Stewart's longtime relationship with Robert Pattinson.
Iovine joined Idol for its tenth season in 2011 to fill the void of the blunt and snarky Simon Cowell, who quit the show to pursue an American edition of The X Factor after starring on Idol since its first season debuted on Fox in 2002.
Iovine served as in-house mentor for three years -- when Interscope Records' Universal Music Group was the show's recording label partner -- until Randy Jacksonreplaced him for Season 13. Up until then, Jackson had served on the regular judging panel every season.