The Black Eyed Peas singer, 34, performed in Berlin on Saturday night.
On Sunday, she was all smiles as she arrived at a U.K. television studio in thigh-high boots and a metallic jacket. She is expected in Paris Tuesday.
Duhamel, 37, also returned to work. A solo Duhamel was spotted shirtless, drinking a beer by his Atlanta hotel pool and reading a script. He is currently shooting the comedy, Life As We Know It, which he is currently shooting.
As the new Us Weekly reports, Fergie is standing by her man, despite claims by Atlanta exotic dancer Nicole Forrester, 34, that she had a one-night stand with the actor.
Her lawyer tells Us Weekly that Forrester has passed a lie-detector test and is in possession of racy texts from the Transformers star that corroborate the affair.
But a pal tells Us Weekly (on newsstands now): "Fergie says nothing is wrong. Every time I ask her how married life is, she says, 'Awesome!'"