I couldn't find just the clip of her song anywhere, so you can just watch the first 2:45 and get the gist without watching the rest. I love Barbra Streisand, and am always amazed at how incredible her voice is. Then I watched Lea Michele perform this and I had three thoughts:
1) She performed it as well as Barbra, IMHO.
2) I can't believe how well she imitated Barbra's style while keeping it her own!
3) My old hollywood crush has officially been upgraded to Lea Michele. (Don't worry, Kate knows!)
The show was on a few weeks ago, so I hope this link lasts for a while. Enjoy!