NBC's The Voice has completed seven seasons with an eighth one airing in February 2015. Unfortunately, not all of the winners have made it big so we're ranking them in order of most successful to least.

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Blake Shelton has mentored the most winners on the show, including Season 2 winner Jermaine Paul, Season 3 winner Cassadee Pope, Season 4 winner Danielle Bradbery and the latest winner, Season 7's Craig Wayne Boyd.

Adam Levine has mentored two winners; Season 1's Javier Colon and Season 5's Tessanne Chin. Usher also mentored a winner, Season 6's Josh Kaufman. 

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1. Josh Kaufman

Of the seven winners, it appears the most successful has been Season 6's winner Kaufman, who currently stars in a Broadway revival of Pippin.

He told Entertainment Weekly in November that he got the gig as Pippin while on The Voice Live Tour this past summer. He shared The Voice can open a lot of different doors and you just have to "try to make the right decisions."

Kaufman's website further explores his accomplishments post-The Voice, which include performing as a headliner for Indy Jazz Fest and acting as Grand Marshal at the Indianapolis 500 Parade.

Over the summer the soulful singer told Yahoo Music's Reality Rocks that he's talking to his label (Universal Music Group/Republic Records) about "the direction" he wants to go in with his album, which he plans to release in 2015.

2. Danielle Bradbury

The next most successful (and youngest) winner in competition history so far is Bradbery. She signed with Big Machine Records and released her debut self-titled album in November of last year. The album debuted at no. 5 on the U.S. Top Country Albums chart.

Her first single off of the album, The Heart of Dixie, charted on multiple charts, including U.S. Hot Country Songs where it peaked at no.16.

She even partnered with NBCUniversal's coverage of the Sochi 2014 Winter Olympics where her song, My Day, was featured.

Bradbery has toured with Hunter Hayes and Brad Paisley and she continues to remain in touch with her mentor from The Voice since she attended the Season 7 finale.

3. Cassadee Pope

Pope is next since she too has seen charting success with her post-The Voice release. Her debut country album, Frame by Frame, released last October, debuted at no. 1 on U.S. Top Country Albums. Her singles have also done extremely well. especially "Wasting All These Tears," which went platinum in March.

4. Tessanne Chin

Chin is next on our list in terms of success. Her major label debut dropped in July and went on to chart at no. 41 on the Billboard 200, which isn't too bad considering she had a "quiet release".

5. Javier Colon

Next we have the inaugural winner, Colon. He charted with his post-The Voice album, Come Through for You and peaked at no. 134 on the Billboard 200.

Colon announced in June 2012 that he was parting with his label. Since then Colon has joined the Concord Music Group roster and intends to release an album by March 2015.

6. Jermaine Paul

Lastly is Paul, who released a single in November 2012 called I Believe in This Life, which flopped. His follow-up single, Next to You, also failed to garner traction.

He still proudly shares on social media that he is the Season 2 winner and on CJAS Music's website for CJAS Music, he says he's "determined to bring back feel-good music and fill the void that is currently missing in R&B."

What do you think of the past winners of The Voice?

Also, Boyd looks like he'll have a promising post-The Voice career. He'll kick off 2015 by debuting at the Grand Ole Opry on Jan. 3.

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