In a legal document, obtained by TMZ.com, Singer writes, "Be advised that these items are not Sylvester Stallone's boxing gloves from the first Rocky and they are not authentic. We therefore demand that you immediately cease and desist from marketing and promoting them as genuine."
The auctioneers have since agreed to take the iconic item off the auction block pending further investigation. Stallone's boxing gloves were among a variety of Hollywood memorabilia items set to go under the hammer at a Los Angeles auction in May.