( PEOPLE.com ) -- Getting engaged made `` Biggest Loser '' contestant Vinny Hickerson feel like he had `` a million pounds of weight off my shoulders . '' Figurative weight , that is . Hickerson , 28 , a singer in the country duo Trailer Choir , proposed to his longtime girlfriend , Lori Diaz , 29 , during a date at the Grand Ole Opry that was filmed for the reality weight loss competition , and will air on Tuesday night 's episode of `` The Biggest Loser . '' `` I wanted to take her there because it 's a place where so many dreams have come true , right there on that stage , '' Hickerson tells PEOPLE exclusively . `` My biggest dream is to be a great husband and a great father , and fall in love . '' `` There was no one there but us and a camera crew , '' says Diaz . `` We sat down in the front row and he gives me a spiel about how he loves me more than anything . '' Hickerson popped the question with a ring from Nashville 's King Jewelers . `` I thought it looked like the Eiffel Tower , which makes people think of beauty and romance , '' he says . `` Just like the first time I saw Lori , out dancing in a zebra dress , I had that same feeling like , 'Oh my gosh , this is the one . ' `` The second biggest surprise of the evening ? A private concert by the country group Thompson Square , who played their Grammy-nominated song `` Are You Gon na Kiss Me or Not . '' `` I could n't believe they were there just for us , in this huge , amazing place , '' says Diaz . Hickerson has been open on the show about his goal to lose weight in order to become a fit future husband and father to Diaz 's 9-year-old son , Brennon . Before , `` I was n't out playing ball with Brennon and even watching him skateboard . I 'd just sit in the car and watch , '' says Hickerson , who is down to 314 pounds after starting the show at 426 pounds `` Now , there is n't anything I ca n't do ! '' Adds Diaz of the proposal : `` I 'll never forget that night for as long as I live . It was so perfect , even more perfect than if I had planned it myself ! '' See the full article at PEOPLE.com . © 2011 People and Time Inc. All rights reserved .
Vinny Hickerson is a singer in the country music Trailer Choir and a ` ` ' Idol '' contestant . ` ` My biggest dream is to be a great husband and a great father , and fall in love '' he said . ` ` There was no one there but us and a camera ##man , '' says Alex Diaz .