The Doctor Who star was reportedly seen close with his former partner while attending the Esquire and Tommy Hilfiger party on Monday (January 7), according to The Sun.
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A source said: "They made a big deal of turning up and leaving separately so they wouldn't be photographed together.
"Once inside the event they were all over each other."
Smith ended his relationship with fashion model Lowe back in November 2011, but the pair have been romantically linked ever since.
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Matt Smith
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An insider claimed last January that Smith and Lowe's split would not last "forever", while they were said to have reunited back in June.
However, neither party has commented on whether they have reunited following their initial breakup.
In pictures - the Esquire and Tommy Hilfiger men's fashion week party:
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