Britney Spears on marriage, babies and Justin Bieber in Harper’s Bazaar

In the midst of planning her new world tour, Britney Spears took some time off and granted an interview to Harper’s Bazaar.

Britney, who is currently in a relationship with Jason Trawick, confessed that she is looking to expand her family. Already a mother to two boys, Sean, 5, and Preston, 4,, born of her marriage to Kevin Federline, Britney isn’t excluding the idea of another child and marriage to Trawick.

“I’ve thought about both,” Spears says. “So if the timing was right…”

After experiencing a hard time in 2007 and 2008, when she had to fight Federline for custody and checked into rehab, Spears talks about how motherhood changed her.

“I think things through a little bit more, and I worry a lot. I’m more straightforward, and I speak up more than I did before,” she confesses. “When I was younger, I wouldn’t speak up as much, but now that I’m a mom, things have changed.”

Brit-Brit proved much more talkative when asked about pop phenomenon Justin Bieber, Spears confessed that she saw her own image from the beginning of her career when watching Bieber’s movie.

“I think he’s adorable,” Spears gushed. “I just saw his movie, and I really didn’t realize how big he was. He’s enormous; he’s just Mr. Man. A lot of the movie is really similar to what I did when i was starting out. I did a promo tour for a year, going into radio stations and all that. It was so cool to see our similarities.”