SHE had a stall in north Dublin city centre, but Mrs Brown has warned fans not to buy unofficial merchandise on sale on Henry Street.
Cashing in on the success of the hit TV series, stall holders are charging €10 each for the T-shirts featuring a seasonal Mrs Brown.
The shirts based on the hit comedy series carry the message 'Merry Feckin' Xmas'.
However, a spokesperson for Brendan O'Carroll has urged fans not to buy the T-shirts as presents for loved ones this December 25.
Instead Rory Cowan -- who stars alongside O'Carroll in Mrs Brown's Boys -- said followers should buy the official merchandise during the run of his show in the 02 this week.
"You could end up with a T-shirt signed by Brendan rather than this rubbish which could fall apart after one wash," he said.
Production of the unofficial merchandise has been fuelled by two Xmas Mrs Brown TV specials and a upcoming film Mrs Brown D'Movie out in June.
"The people making this stuff know Mrs Brown will still be around next Christmas and she will probably be even more popular," added Cowan.
But if the Finglas funnyman himself is losing out financially, he seemed not to mind.
"That's what dealers do," Brendan chuckled when asked to comment.
The comic Brendan O'Carroll is estimated to have earned €10m from the royalties of his hit series which has overtaken The Office and Little Britain.
Co-star Rory Cowan, who plays Mrs Brown's gay son in the sitcom and film, revealed recently how he paid off his mortgage thanks to the show's success.