(CNN) Meghan Markle, Duchess of Sussex, will make her first public appearance Saturday since the birth of her son, Archie Harrison Mountbattan-Windsor.

A royal source exclusively told CNN the duchess is expected to attend the traditional Trooping the Colour , a celebration of the Queen's official birthday on Saturday.

Although the duchess is still on maternity leave, the royal source says this is a family moment, where many members of the royal family will be in attendance. Archie will not be among them.

According to the palace's source, this is a separate affair from the duchess' official duties of participating in a formal state visit.

Similarly, Catherine, the Duchess of Cambridge, also attended a previous Trooping the Colour during her maternity leave, but did not carry out any official duties.

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