There are a million sites out there with a shit ton of embedded Youtube videos. So the question is will they really notice and will they do anything about it. If they contact you and tell you to stop, then stop. But they're not going to sue you.
If you want to make it a bit more legit-looking you can just leave your own "commentary" below each video as content, which can be totally stupid randomness of the top of your head. Like "This is a video of Britney Spears. I really like Britney. I remember when I was in high school and she wore that high school uniform in the video. That was cute! But now she is more adult and her videos are more sexy. Especially this video! It is a great video with lots of drama. Please watch it and sing along! Britney is the best." blabla. Take 20 seconds to write some bullshit and throw it up there.