The ad works well with the deep pink lipstick and blush, set off by her rose-hued dress and the co-ordinating pink-and-orange backdrop.
The feminine palette is a stark contrast to Miss Watson’s previous Lancome campaigns, which have seen her emerge with black eyeliner and bold red lips.
Miss Watson, who has been in a relationship with Oxford University student Will Adamowicz since 2011, was the youngest-ever face of Lancome when she was signed by the brand in March 2011.
She said at the time: ‘For me Lancome is an authentic brand. It reflects elegance, class and style.’
Miss Watson is believed to be putting her film career on hold once more in order that she can return to her studies at Brown.