"They are extremely happy," a representative told the Daily Mail of the couple, who started dating last June. Spiegel, 25, is said to have popped the question to the former Victoria's Secret Angel earlier this week, with Kerr spotted out and about with a gem on her engagement-ring finger.
It will be the second marriage for 33-year-old Kerr, who was married to British actor Orlando Bloom from 2010 to 2013 and with whom she has a five-year-old son, Flynn. Spiegel will now become step-father to Flynn which, Kerr revealed earlier this year, Bloom is more than comfortable with.
"My ex and I decided that we had to know the person for six months and feel good about them before introducing them to Flynn," she said. "Evan met Flynn, so yeah, things are going well. Orlando thinks he's great. We're just a modern family now!"