The 44 year-old singer has allegedly singed a contract to be on the NBC singing talent show for one season.
Gwen Stefani is the newest coach on 'The Voice'.
The 44 year-old will be replacing the departing pregnant Christina Aguilera on the NBC show for the forthcoming 7th series, which starts filming in June.
The television network wanted Aguilera to continue working during her pregnancy but she is already finding it extremely hard, and ultimately decided to walk away.
A source close to the situation also confirmed the news of Stefani joining the singing talent show by telling Us Weekly, her "contract is now done."
The 'No Doubt' singer is reportedly only contracted for one full season, but a spokesperson for NBC commented earlier in the week, "We haven't made any decisions at this point."
Bringing Stefani o board isn't the only high-profile addition NBC have made for 'The Voice' season 7.
Music mogul Pharrell Williams is also set to join the show as a coach as he is replacing the departing Cee Lo Green.
'The Voice' Twitter handle posted, "WE ARE SO #HAPPY to announce PHARRELL WILLIAMS = #NewVoiceCoach for SEASON 7," to confirm the news.
Season 6 of 'The Voice' began late last month on February 24th, and features original coaches Adam Levine and Blake Shelton, and also sees the return of Usher and Shakira to the spinning chairs.
It was also announced earlier this month that Coldplay's frontman Chris Martin will appear on 'The Voice' as a guest mentor for the second round of battles, providing aid to all of the show's contenders.
Gwen Stefani will be a coach on 'The Voice'