Sheryl Sandberg, the Chief Operating Officer of Facebook and author of the bestsellers Lean In and Option B, has announced that she is engaged.

A representative for Sandberg confirmed to celebrity magazine People that she and boyfriend Tom Bernthal are to wed after becoming engaged last weekend. The couple have been dating since last Spring.

Sandberg shared the news with a photo on Instagram, writing: "Engaged!!!! @tom_bernthal, you are my everything. I could not love you more."

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Sandberg and consultancy CEO Bernthal were introduced by Rob Goldberg, the brother of Sandberg's late husband Dave, who died suddenly in 2015.

People says the couple became engaged after a hike and picnic over the weekend at the Vermejo Park Ranch in New Mexico. 

"They took a hike together on their very first date, so they recreated the moment and got engaged at the end of a long hike this past weekend," a source said.

People says Bernthal proposed to Sandberg with a "ring featuring five tiny hidden diamonds underneath the setting to represent each of their five children".