She told him that she wondered what he was up to, which led to Martin (played by James Bye) looking him up on social media and sending him a message on her behalf.
He was at the centre of a love triangle between Michelle (Jenna Russell) and Sharon Watts (Letitia Dean) and ended up having a brief fling with both of them.
Kelvin was also part of Albert Square's very own pop group The Banned, which was made up of Eddie Hunter, Simon Wicks, Sharon, Ian Beale and Kelvin himself.
Paul J Medford played Kelvin Carpenter from 1985 to 1987
Jenna Russell stars as Michelle Fowler in the BBC soap
He left Walford in 1987 to take a computer studies course at university and has not been seen since.
But, following Michelle's namedrop last night, fans began to speculate whether or not he will make a surprise appearance in upcoming scenes.
The reference to Kelvin comes just as EastEnders are lining up a love twist for Michelle, which will see her arrange to meet up with an old friend.
However, she is stood up by the friend and ends up having a drink with Jay (Jamie Borthwick) and Ben Mitchell (Harry Reid) instead.
Jay invites Michelle to join him for a drink
Soap stars then and now
Wed, February 1, 2017
From EastEnders' longest running character Ian Beale, to Coronation Street's Sarah Platt, take a look and see how much these soap stars have changed.
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June Brown, star of EastEnders then and now
Michelle receives a Valentine's Day card from a mystery admirer
But, the next day she gets a surprise when a Valentine's Day card arrives from a mystery admirer – could it be from Kelvin?
While soap bosses are remaining tight-lipped about the upcoming storyline, they promised Michelle will be left with a spring in her step.
EastEnders continues tonight on BBC One at 8pm.