Roberto Martinez may reportedly be ready to take his relationship with Playboy model Sara Jean Underwood to the next level.

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Former The Bachelorette winner and Underwood began dating in 2012, and a source close to Martinez told Us Weekly in its latest issue their relationship is "very serious" and the couple is "talking marriage."

After all, Underwood had "moved to San Diego for him" shortly after they met, said the source.

Martinez reportedly celebrated Underwood's 30th birthday while vacationing at the Villa La Estancia in Riviera Nayarit, Mexico on March 14.

"The resort was beautiful," Martinez, 30, told Us.

The pair allegedly celebrated the Playmate's special birthday by riding ATVs, enjoying a private dinner in their suite and getting massages during their four-day stay.

Martinez and Underwood "love being sporty together," a pal told the magazine.

Martinez's ex-fiancee Ali Fedotowsky announced she and the insurance salesman were splitting in November 2011 after getting engaged on The Bachelorette's sixth-season finale broadcast, which aired in August 2010.

However, reports circulated in January 2013 Martinez and Fedotowsky had hooked up at fellow The Bachelorette couple Ashley Hebert and J.P. Rosenbaum's December 2012 wedding.

About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.