How does a celebrity like Kanye West know when he's really made it? When he's been spoofed by South Park? When he's appeared on The Cleveland Show?

No -- when he's been mentioned in the same sentence as The Muppets ... or Josh Groban.

In the video above, Oscar and Grammy nominee Groban has lifted West's own words for his latest album. The Best Tweets of Kanye West rivals the Twitter-based duet -- "Tweet Tweet" -- Drake and Jimmy Kimmel collaborated on earlier this year.

After the jump, you can also see the Muppets of Sesame Street take on a NSFW version of "Monster." Now that we've seen the PBS characters singing both Lil Jon and Kanye West songs -- should we say a bright future in rap is ahead of them?