Why so serious? Kylie Jenner posts another moody selfie... as sister Kendall packs on the PDA with Harry Styles

You would think that sharing a reality show empire with her family, posing for photo shoots, and designing an exclusive collection of clothing with her sister would be enough to make Kylie Jenner smile from ear to ear.

But the 16-year-old has seemed anything but satisfied in recent selfies. On Saturday the Keeping Up With The Kardashians star posted yet another forlorn Instagram shot.

Meanwhile, her sister Kendall, 18, was spotted looking thrilled to be in the arms of her boyfriend Harry Styles on Friday at an Eagles concert in LA.

In Kylie's selfie she had a blank expression as she tilted her head to the side with hair in her face.

Though Kylie's eyes might have shown her actual emotions, they were hidden behind a pair of white cat-eye sunglasses with shiny blue lenses.

The reality star took the selfie during a shoot in Sun Valley, California.

It was for an exclusive fashion line she shares with Kendall.

The siblings designed a collection for PacSun, a retail clothing, footwear and accessories brand for teens and young adults.

Kylie's latest Instagram snap is just one of a string of images where the reality star seems to be blue beginning with something she had posted on the usually joyous holiday of Christmas.

On December 25, the stunner had a far-off sad look as she posed in goth-themed makeup for a selfie.

Though she looked pretty with her nicely groomed eyebrows and perfectly applied deep red lipstick, there was a sadness in her eyes.

A black jacket and matching black choker only added to the darkness.

Two days later the younger sister of Kendall appeared downcast as she was photographed looking at her cell phone while appearing to be dining solo at a cafe.

Her hand was hiding her mouth, but it didn't seem like there was a smile going on.

A dark hat and black-and-white shirt left little room for happy colors.

The only cheerful thing about the image were the gold bangle bracelets that hung on the OPI spokesperson's wrists.

Later that day she posted an even darker snap.

In this one, she looked pretty in her heavy makeup, but she again failed to smile. Instead she gave off an empty stare as she showed off her heavily pierced left ear.