McGregor, 46, met the handsome brunette at The Good Life Eatery in St John's Wood, North West London over the weekend.
Scottish actor McGregor and the French-born Mavrakis had met on the set of the British TV show "Kavanagh QC" when he was appearing in a 1995 episode. A customer tells the tabloid the pair seemed "relaxed" together and were "deep in conversation" for more than an hour. The couple has four daughters together, including an adopted daughter from Mongolia. "As they left she got onto the back of Ewan's motorbike and they sped off together".
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'Sitting here with my best friend who I love with all my heart. "We are still ride or die, just in a different way now", she said on Instagram in a now-deleted post that was captured by People.
Writing on her Instagram page at the time, Mary Elizabeth told her fans: 'We've made a decision to move on from our marriage, but we will stay best friends and collaborators for all our days. "I love you always, Riley", Winstead wrote, according to The Cut.
Reps for McGregor did not immediately respond to a Daily News request for comment.