Kendall and Kylie Jenner's attempt at sexy lip-syncing is way off the mark

After all those random lip-syncing Snapchats, you'd think Kendall and Kylie Jenner would have nailed miming while sexy dancing by now. Unfortunately not, based on this evidence…

The Jenner sisters' pal, 20-year-old R'n'B singer Justine Skye, somehow thought it would be a good idea to rope them into her lyric video for her new song 'I'm Yours' (featuring rapper Vic Mensa).

At first we thought Kendall and Kylie were intentionally being awful, but they can't be that convincingly bad on purpose.

Watch them wrap their mouths around lines like "You know I'm feeling you and you like it" above.

Um…at least they tried?