Danedream, winner of the 2011 Prix de l'Arc de Triomphe, has been confirmed in foal to Frankel.
The German filly went on to claim last year's King George at Royal Ascot but was denied the chance to defend the Arc due to quarantine restrictions at her Cologne training base following an outbreak of swamp fever.
She was retired at the end of last season with five Group One wins and has been boarding at Newsells Park Stud which confirmed her pregnancy on Twitter.
"Pleased to report that Danedream was scanned in foal to Frankel this morning," the stud said.
Dual world champion Frankel is reported to have taken to his new career well, with 12 of his first 15 mares covered confirmed in foal earlier this month.