Four months after confirming their relationship, No Doubt rocker Gwen Stefani and her country star boyfriend Blake Shelton might be ready to take their relationship to the next level. The adorable "The Voice" couple has been spotted out and about together and enjoying themselves, most recently at the 88th annual Academy Awards, where they made their relationship red carpet official. Now, sources say that Shelton and Stefani might be in for the long haul.

Stefani has been promoting her upcoming album "This is What the Truth Feels Like," which is set for a March 18 release. She opened up in a recent radio interview about how Shelton inspired her new single about newfound love titled "Make Me Like You," and she giggled like a school girl while talking about her beau during her appearance on "The Ellen DeGeneres Show." However, the "Hollaback Girl" singer's relationship with Shelton seems to be more than just a fling.

"They seem too perfect for each other for it to just be fluke," a source close to Stefani told People. "For now, they seem happy with their relationship, but Blake is old-fashioned and a future engagement seems very possible."

Stefani and Shelton first stepped out as a couple over Halloween weekend last year, and a rep for Stefani confirmed the relationship in November. The couple met on set of NBC's "The Voice" where they both served as judges on the singing competition series. They sparked dating rumors shortly after their respective divorce announcement- Stefani split from her Bush rocker husband Gavin Rossdale last August after 13 years of marriage, and Shelton split from his country singer wife Miranda Lambert last July after four years of marriage.

After her split from Rossdale, the source said Stefani questioned "if she would ever meet someone that would accept her boys." The LAMB fashion designer shares three sons with her ex-husband: 9-year-old Kingston, 7-year-old Zuma and 2-year-old Apollo.

A source close to Shelton told People that the country heartthrob "had no hesitation" in meeting her sons, but the couple has decided not to put "pressure on themselves," even though the couple's friends see a "long-term future" ahead of them.