The Australian celebrity couple, who met while playing Rachel and Jake in Packed To The Rafters, were rumoured to be on the rocks after she quit the show and flew to the US alone for various auditions.
According to The Sunday Telegraph, Marais returned home to Sydney last week and was photographed kissing Stewart upon her arrival.
She said: "I wasn't [in Los Angeles] for long; it was really like a holiday. And [James and I] spoke every day. Thank God for Skype."
The couple were spotted buying burgers in a cafe last Friday, before flying to Queensland together for a friend's wedding.
Marais also revealed that she is planning on heading back to LA in the next fortnight but "only for a few days".