Gwen Stefani is blessed with youthful looks as it is, but the No Doubt hitmaker went one step further over the weekend – going back several decades in the process! MORE: Gwen Stefani celebrates incredible news with Blake SheltonTaking to Instagram ahead of The Voice, the star shared footage of herself with a baby face filter, telling fans about the finale of the hit show, which airs on Monday night.Gwen told her followers: "I just wanted to say I'm really excited for The Voice.