Justin Bieber's 'Boyfriend' Poised For Big Debut

The lead single off Believe could sell 400,000 downloads in its first week.

He's beloved by millions of teenage girls who already think of him as their "Boyfriend," and now Justin Bieber's edgier track seems poised to be one of the teen star's biggest hits yet.

According to Billboard, the song, which dropped Monday, could sell upwards of 400,000 downloads in its first week, giving it a big push on next week's Billboard Hot 100 chart. This would give the singer his best sales week for a song to date in his career.

His biggest thus far belongs to "Never Say Never," which moved 199,000 downloads in its first week, eventually peaking at #5 on the Digital Songs chart.

Based on the estimates for his Hot 100 debut (which takes into account radio airplay, sales and streaming data), Bieber could land in the top five going into next week. So far, his most ubiquitous track, "Baby,"

is also his highest debut on the Hot 100, having landed at #5 in 2010.

It seems that radio is also embracing the lead Believe single. While Bieber has always had a large fanbase and solid record sales, radio airplay has eluded him a bit. But Billboard further reports that this song could land him in a solid place on the Pop Songs top 10 based on early airplay.

So far, he's only managed to land at #14 in 2009 with "One Time" and

#16 with "Baby."

"Boyfriend" was co-produced and co-written by Mike Posner, who explained to MTV News that they always intended to make a song that would shift Bieber's career from tween heartthrob to legitimate pop star.

"I think our goal was to make something that me and my friends could listen to in the car," Posner explained. "I think we've all known Justin since he was 13, and that's not the kid I was in the studio with anymore. He's an 18-year-old. He skateboards with Lil Wayne and hangs out with Lil Twist. Those are his homies. And he listens to hip-hop and he's a really cool kid. He's not like a corny guy."