Encounters between celebrities and fans are not complete without selfies and autographs.

Grammy Award-winning country singer Keith Urban, 57, recently shared an unforgettable experience with a fan on The Kelly Clarkson Show.

“I was playing a show, and this girl yelled out from the audience, ‘Will you sign my leg?’” he recalled, Fox News reported.

“I said, ‘Yep, come on up!’ Then she disappeared; I couldn’t see her. Then she popped up in the same spot...,” Urban told host Clarkson.

Next, a prosthetic leg landed on the stage with a thud. It was the fan’s leg that Urban was to sign.

After signing the leg, Urban said he wondered how he would return it to its owner.

“I gave it to the audience; they surfed it back, and she popped it back on. It was rock and roll.”

Stars are also fans of other celebrities, and autograph signing is in order when they meet.

Barbadian singer and businesswoman Rihanna watched Mariah Carey’s concert at New York’s Barclays Center on 17 December to show her support to the “All I Want For Christmas” singer.

Carey went down from the stage to greet front-row fans and spotted Rihanna, who asked for an autograph. The American performer obliged, and Rihanna yelled for a Sharpie.

Rihanna then presented her left breast, to which Carey affixed her signature.

The “Diamonds” and “Umbrella” singer then grabbed the mic and proudly announced to the crowd, “Mariah Carey is signing my tit, y’all,” y! entertainment reported.

Jason Lee, podcaster and founder of Black-owned media and entertainment brand Hollywood Unlocked, was with Rihanna and captured the breast signing on his phone camera.

After the autograph, the two stars hugged.

WJG @tribunephl_wjg