Selfies have become all the rage on social media in the past few years, and the latest expert guidance on how to take them comes from reality-TV stars Kendall and Kylie Jenner. The half-sisters of Kim Kardashian should know how to perfect a photo for Instagram: After all, their older sis has been posting selfies for years, showing off her perfect contouring and newly applied makeup on her social media accounts.

"We actually like to keep it really simple. It's all about knowing your light and angles," Kendall tells When asked if they pay attention to all those likes, Kylie replied, "Not really. It would be sort of crazy if we did, but it's so nice to know people like the photos we're sharing."

Meanwhile, after posting numerous selfies on Instagram, Kendall, 16, has faced accusations that she got plastic surgery on her face. The young reality TV star is accused of getting lip injections, months after she denied getting a nose job.

“It appears she has had hyaluronic acid injected into her lips. This is administered via fillers such as Juvederm and Restylane,” Dr. Diamond, who has not worked with Jenner, told Radar Online. In recent pictures, the youngest Kardashian sister has uploaded onto Instagram, it does seem like her lips are fuller than usual, though it could just be a great lip plumper product.

In April, Jenner expressed outrage after being accused of altering her face with a nose job. “These plastic surgery rumors hurt my feelings, to be honest, and are kinda insulting. … Just in case anyone forgot ... I’m 16,” she wrote on Twitter.

In March, fans of "Keeping Up With the Kardashians" speculated that Jenner got a nose job after her nose appeared thinner than usual in photos that she posted on Instagram. In addition to a nose job, reports also claimed she had gotten botox injections, a cosmetic procedure that Kim has admitted to in the past.