Michael Jackson offered a brief glimpse of himself during a visit to a friend in the northern German city of Hamburg.
The 47-year-old pop star waved to fans Sunday through a gap in the curtains in one of the windows of the house.
Police confirmed that Jackson had been in Hamburg since Thursday. He was staying with the family of Wolfgang Schleiter, a music manager.
More than 100 fans gathered in freezing temperatures outside the house in the city's Niendorf district.
Last week, Jackson was spotted shopping in a mall in Manama, Bahrain, hiding his face behind a veil and donning a black robe traditionally worn by women in the Gulf.
He was with three children, apparently his own, who also had their faces covered by dark scarves. An unidentified woman accompanied them.
Jackson was acquitted in June on child molestation charges in California. The pop star, who seems to be settling in the Persian Gulf, was seen leaving Marina Mall in the Bahrain capital, holding a child by the hand.