EMILY PRESCOTT: Elizabeth Debicki imitates Princess Diana

Pulling a baseball cap over her blonde bob was always 's ploy when attempting to go incognito.

Now , who won plaudits for her role as the late Princess in drama , appears to have borrowed the technique. But both are too famous to miss.

The Australian-born actress, 33, was spotted wearing a red baseball cap during a shopping trip in Central London with her rarely-seen partner Kristian Rasmussen. They are notoriously private and haven't spoken of their relationship.

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