Chelsea Handler's been dodging questions about her relationship with rapper 50 Cent, but it only fuels the rumors of a romance between the two when he shows up unannounced on her show!

And 50 did just that yesterday (for the second time in days!), making a surprise appearance backstage with Keenan Cahill, the 15-year-old YouTube sensation, joining Cahill in a lip-sync to "Down On Me."

Chelsea kept quiet on her rumored beau's appearance... but the more she tries to avoid, the more we think there's something to hide!