The 50-year old guitarist currently resides in LA while the 36-year old former model lives in Florida.
According to the source, Elin flies to L.A. on her private plane a lot.
After being introduced by their mutual friend, Rossdale and Nordegren now wanted to take their relationship to the next level.
Rossdale and Nordegren have something in common - their marriage ended with cheating scandals.
In Rossdale case, he was reportedly cheating with his family's nanny for many years, according to Huffington Post. While Nordegren divorced from Woods in 2010 following his confession of infidelity.
Stefani filed for divorce in August 2015. The divorce were finalized in April 2016. They have three children - Kingston, 10, Zuma, 8, and Apollo, 2.
Nordegren chose to end their marriage and the divorce was finalized in August 2010. She had two children with Woods - Sam, 9, and Charlie, 7.
Afterward, she dated billionaire Chris Cline before starting a relationship with Rossdale.
Rossdale is a lead singer and guitarist of British rock band Bush for 10 years before the band was broke up in 2002. Hit Parader magazine put him on the list of Top 100 Heavy Metal Vocalists.
Up to now, neither Rossdale and Nordegren made any comment on their relationship status. But sources said that they are planning to make the relationship to work.
