Pop star Britney Spears insists pregnancy leaves her feeling far from beautiful and glowing - despite posing naked with her bump on front of Harper's Bazaar, according to au.launch.yahoo.com.

The 'Toxic' singer is expecting her second child with husband Kevin Federline in October.

While Spears was happy to strip off for the August edition of the glossy magazine, she tells the publication,"(during pregnancy) you don't feel the most beautiful all the time."

Britney Spears, who is pregnant with her second child, says she's not ready to retire from performing.

"I can't wait to do that again," Spears, 24, tells Harper's Bazaar in its August issue, on newsstands July 25. "But I really have to take my time and do it right and be safe. Actually ... not that safe. When you perform, you have to be dangerous."

The pregnant pop princess also says she would "definitely" consider a musical collaboration with her husband, Kevin Federline, 28. His debut hip-hop album, "Playing With Fire," is expected to be released next month.

Spears, who darkened her hair and posed naked for the camera of lensman Alexi Lubomirski for the Bazaar photos, says her first pregnancy made her feel "paranoid" because she was new at everything.