Under intense scrutiny from a U.S. senator, Mayor Gavin Newsom said he had not set a date for his wedding, but party planners indicate that it will be a summer affair.

At a news conference Thursday announcing $82 million in federal funds to clean up portions of the Hunters Point Shipyard — including the 25 acres for a potential new stadium — U.S. Sen. Dianne Feinstein, D-Calif., grilled the newly engaged mayor about the big day.

“I think what both Nancy [Pelosi] and I know about this arena is it’s very hard to do it over a substantial period of time alone,” Feinstein said as Newsom smiled and began to turn red.

Newsom, 40, asked his girlfriend, 33-year-old actress Jennifer Siebel, to marry him last weekend as the two vacationed with her family on the big island of Hawaii.

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Newsom began his tenure as mayor married to Kimberly Guilfoyle, a former assistant district attorney with The City, but her career took her to New York City as a television legal analyst. The stress of a bicoastal marriage led them to file for divorce in 2006.

But it was all smiles Thursday as Feinstein, a former mayor of The City herself, continued to lay it on thick for Newsom.

Feinstein, who has been married for 29 years, said her home was the one place “that I know I’m not going to be criticized,” she said.

But before she surrendered the floor, she had one question for the mayor as the room descended into laughter: “When is the big day?”

Newsom, laughing and completely red at this point, could only muster a “not yet” as Feinstein pressed for a specific date.

However, party designer Stanlee Gatti, a good friend of The City’s first couple who is working to plan the pending nuptials, said they wanted a summer wedding.

dsmith@examiner.com