This is kinda surprising! Kylie Jenner has taken the unusual step of basically collabing with frenemy Taylor Swift on her new Lip Kit items, naming new shades after some of the singer's most famous singles!

In Kylie's Valentine's Day collection, she's given the "Built To Last," "Story Of Us," and "Forever And Always" monikers to some shades of her new holiday palette.

So first off, Kylie MUST have asked for permission to do this, otherwise she could be sued. And we know TSwiz is fairly litigious. Second, it's a friendly move, obviously -- it's great for both stars in terms of cross-promotion (particularly for the practically forgotten-about Taylor to be featured in the #1 beauty brand's latest offering). Third, a source tells Radar that as of Swift's singing with Universal Music in November, the feud between Swiz and Kimye is squashed: "Since Taylor signed her new record deal, she is off limits to Kim. Their war of words is over. Universal owns E! So Kim has to be nice. She was told by the bigwigs."

In fact, last week on Andy Cohen's Watch What Happens Live, Kim said she'd rather be stuck in an elevator with Taylor than with Drake -- both of whom she and Kanye have longstanding beefs with.

As further promotion for Kylie's new Valentine's Day collection, she participated in a "rapid-fire question game" livestream and we've got it here for you ... if you have the patience. Watch out, the questions and answers are RIVETING!