McGregor, 46, Mavrakis, 51, called it quits on their 22-year marriage in May, an unnamed "family source" told the magazine.
Winstead also broke up with her husband in May.
That was until pictures surfaced of McEwan kissing American actress Mary Elizabeth Winstead on Monday (NZ time) at a London cafe. The former couple have four daughters, the oldest of whom, Clara McGregor, is a model in her 20s. The "Star Wars" actor and the 32-year-old actress play on-screen lovers in the United States telly show 'Fargo.' Winstead split from her husband, Riley Stearns, in May after seven years of marriage.
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The couple met on the set of court drama Kavanagh QC in 1995, shortly before the Scottish star's portrayal of heroin addict Mark Renton in Danny Boyle's Trainspotting won him worldwide acclaim. The two have four daughters together.
"They were deep in conversation and were there together for more than an hour". They then left together on McGregor's motorbike.
"I wasn't sure whether that was a true love or whether she's manipulating him", she said.
Meanwhile, Riley, who Mary met aged 18 on an ocean cruise, shared the same photo on his Instagram with an equally touching tribute which said: 'I'll always love you, Mary'.
McGregor, Mavrakis and Winstead have not commented.