Dáil versus Dynasty - When Joan Collins took on Joan Collins over protest arrest
One shot to fame playing the scheming, shoulder pad-wearing Alexis Carrington in 1980s hit TV show 'Dynasty'.
The other is a former An Post clerk turned TD from Dublin's north inner city.
They may move in different worlds, but yesterday the two Joan Collinses collided via the medium of Twitter.
Things kicked off when 'The Bitch' herself - Dame Joan Collins (81) - took to Twitter to clarify she had not been arrested at an anti-water-charge protest in Dublin.
The soap star was referring to the arrest of Dublin South Central TD Joan Collins in Harold's Cross on Monday.
"No I am not the Joan Collins who was arrested yesterday at a Dublin protest meeting!" Dame Collins exclaimed. "The very idea!!"
British-born Collins was nowhere near Parnell Road at the time of the incident.
In fact, she spent most of Monday recovering from actor Michael Brandon's birthday party by having a long hot bath.
TD Joan Collins seemed equally upset by the confusion. "For the record I am not Joan Collins OBE," she wrote. She added: "I'd never take an honour from a Monarch. Nor did I wear shoulder pads in the 80s. The very idea!"
The TD later admitted this was a mistruth; she did wear shoulder pads during the late 80s, but defended the fashion faux pas. "There was very little choice in the 80s," she explained. "But I'd never take an honour from a monarch."
Power-dressing to one side, the two women have vastly different political leanings.
Five-time married actress Collins describes her viewpoint as "Conservative party, 1940s" and is a great admirer of the "Iron Lady" Margaret Thatcher. Collins, who received an OBE earlier this year, became a patron of Ukip in 2004.
'The Stud' actress has stressed, however, this does not mean she would vote for the party.
Meanwhile, Collins - the Irish one - insists she has never been "influenced" by the actress. "We are completely different," TD Joan Collins told the Irish Independent. "I doubt we have anything in common bar the name. In no way has she influenced me."