Kylie Jenner debuts short hair, denies pregnancy rumors

LOS ANGELES, July 15 (UPI) -- Kylie Jenner took to social media Thursday to debut a new hairstyle and deny pregnancy reports.

The 18-year-old reality star showed off her bob haircut in a series of posts before attending a charity event for the Los Angeles LGBT Center and Stomp Out Bullying.

"Wearing blue today to support the end to bullying," she wrote on Instagram. Jenner collaborated with the nail color company SinfulColors on a limited edition set to benefit the center and the anti-bullying organization.

The Keeping Up with the Kardashians star, who frequently changes up her look, shared a selfie of her outfit for the event. She had posted other pictures of her short hair while wearing a black dress earlier in the day.

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Kylie Jenner wore a plunging jumpsuit to a charity event Thursday evening. Photo by Kylie Jenner/Instagram

Jenner returned to social media that evening following fresh rumors she's pregnant and expecting with boyfriend Tyga. The reality star previously denied pregnancy reports in February.

"Omg. No I'm not pregnant. It's been the same rumor for years & no baby," she wrote in a since-deleted tweet. "When I decide to go to that next stage in my life.. I"ll be the first to let you know.. Not a weekly blog."

InTouch had reported Jenner's supposed pregnancy the same day, with a source saying it was "the obvious next step" for the couple. Jenner and Tyga recently reconciled after splitting in May.