It was an announcement made amid a swirl of tabloid speculation: Kimberly Guilfoyle, a loyalist of President-elect Donald J. Trump and — more pointedly — the fiancée of his son Donald Jr., had been named ambassador to Greece.

The timing of the move — early Tuesday evening — would have been unremarkable except for what preceded it: rumors that the president-elect’s eldest son was dating a socialite, Bettina Anderson.

The new relationship was seemingly documented in a series of photos published earlier on Tuesday by the British tabloid The Daily Mail, which described them as “incontrovertible proof the soon-to-be First Son has moved on” with a “stunning ‘it girl.’”

Andrew Surabian, a spokesman for Mr. Trump, 46, did not return a request for comment on his relationship with Ms. Anderson, or on his engagement with Ms. Guilfoyle, to whom he has been betrothed since late 2020. Ms. Anderson, 38, also did not return requests for comment.

In his announcement of her posting to Greece, the president-elect called Ms. Guilfoyle “a close friend and ally,” but made no mention of her relationship with his son.

“Her extensive experience and leadership in law, media, and politics along with her sharp intellect make her supremely qualified to represent the United States,” the elder Mr. Trump wrote, in a post on Truth Social.

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