Martina McBride is "somebody with a big voice, but an even bigger heart." Those words, spoken by staff at the Covenant House homeless shelter in Newark, New Jersey, couldn't be more true.

On March 1, McBride popped in for a surprise visit with homeless teens at the Covenant House and even brought along tickets for her sold-out concert with George Strait.

"We would love to have you and I will be looking out into the audience to see your smiling faces!" said the 'Concrete Angel' singer amidst thunderous applause and cheering.

The superstar visited the Covenant House with volunteers from Team Martina, who played games with the teens, handing out ice cream and other prizes along with those killer, impossible-to-snag concert tickets.

“I want to thank Team Martina for all of this that they’ve done for y’all and I want to thank Covenant House for all that they do,” McBride told the crowd. “It sounds like a really special place and we’re happy to be here."

Team Martina is a global community of McBride fans who are seeking to change the world by volunteering and fulfilling a need in every town the singer performs. Volunteers raised $30,000 towards new construction of a playground for kids in the inner-city in in Atlanta, Georgia, and in Nashville, the team raised $40,000 for cancer research at Vanderbilt University -- just to name a few charitable efforts.

Of course, it's honorable that McBride is finding time to spread all that goodwill with everything that she has going on in 2014! Her new album 'Everlasting' is set to release on April 8, and she's even set to unveil an entertaining cookbook, Around the Table, in October.