The couple, who split in 2014, are on holiday together in the Swiss ski resort of St. Moritz this week (beg7Mar16), and have been spotted kissing and looking loved up.
The pair were seen getting close on the slopes after checking into a hotel in the exclusive Alpine destination, three months after they were seen chatting at a New York fashion event in December last year (15).
Elin and the American mining entrepreneur first began dating in 2013, three years after she finalised her divorce to Tiger.
The couple's romance ended one year later as they split in August 2014, but recent reports suggested the Florida neighbours had rekindled their relationship.
The Swedish model reportedly purchased her Palm Beach home next to Chris' with some of the $100 million (£70 million) she received from the golfing icon in their divorce settlement.
She split from Tiger, with whom she has two children, after he publicly admitted multiple infidelities in 2009.
The sports superstar's frank admission of cheating came after a media frenzy sparked by an incident which saw Tiger crash his car into a tree near his home.
Speaking to People magazine about her then husband's extra-marital affairs in 2010, she said, "I never suspected. For the last three-and-a-half years, when all this was going on, I was home a lot more with pregnancies, then the children and my school."
After the couple's divorce, Tiger dated American skier Lindsey Vonn, but split from the Olympian in May last year (15).