The 22-year-old Sport Illustrated cover girl and the Detroit Tigers pitcher were photographed enjoying the summer by sun tanning in Cancun.
Eyewitnesses tell E! News the couple was "very loved up and enjoyed being with each other" during the three-day vacation. Upton allegedly got a bit sunburned the first couple of days, but powered through the rest of the trip without complaining.
Upton and Verlander first ignited rumors that they were dating after going on a Caribbean vacation together in 2013. The model later dated Dancing With The Star pro Maksim Chmerkovskiy for six months before being spotted with Varlander again in January 2014.