LONDON (AP) — Britney Spears is branching out.

After 16 years in the music business and nearly 100 million record sales under her belt, the 32-year-old singer has added "designer" to her busy resume.

The pop star launched her debut collection of lingerie and sleepwear, called "The Intimate Britney Spears," in London Tuesday night.

The line, which Spears describes as "romantic, feminine and subtle," has been 2 1/2 years in the making.

"It's been a really long process but it's been a lot of fun," said Spears, who says she's become "obsessed" with lingerie.

Spears flew into London to promote the collection during a break in performing at the Planet Hollywood Resort and Casino in Las Vegas.

Despite crisscrossing the globe and appearing in the world's most prestigious venues, Spears believes her two-year residency in Vegas is "ideal" and "really grounding" for her two young sons, Sean Preston and Jayden.

"Looking back now and I see how I used to travel around the world and I am like 'oh my god, I must have been out of my mind.' It was really crazy," she said.

Spears' time in Vegas comes to an end in February. In the meantime, she'll also be working on her ninth studio album.

The singer, who recently broke up with boyfriend David Lucado, confirmed that the writing process is underway and the album will include lots of "I hate men and I love men" tracks.

A release date is yet to be announced.

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Online: http://www.intimatebritneyspears.com