Christie Brinkley, 71, snaps red-hot bikini selfies during boat ride

Christine Brinkley rocked a red-hot bikini for a boat ride this weekend.

The 71-year-old shared smiling selfies via Instagram Sunday, telling her followers that she was “feeling optimistic.”

The Sports Illustrated Swimsuit cover girl, who completed her look with two different hats and a red cover-up, gushed, “Wishing everyone bright sun shiny days ahead!”

She concluded her caption by promoting her upcoming memoir, “Uptown Girl,” which comes out later this month.

Brinkley’s fans called her “goals” in the comments section, with one writing, “Can’t believe your age. It is incredible. It is ridiculous.”

Another wrote that she was “lookin’ hot at 71,” with a third praising her “red bikini and a smile.”

The model revealed the cover and title of her memoir in February, with HarperCollins Publishers imprint Harper Influence calling it a look at her “whirlwind career.”

The book will also divulge details about Brinkley’s “four tumultuous marriages” to François Allaux, Billy Joel, Richard Taubman and Peter Cook.

She welcomed daughter Alexa, 39, during her time with Joel, as well as son Jack, 29, and daughter Sailor, 26, while married to Cook.

The businesswoman wrote her memoir to “inspire readers to create the life they want.”

“I’ve always tried to do [that],” she said in a statement. “Not through fortune or fame, but by saying yes to adventure and trying to find the magic in every moment, no matter how big or how small.”

“Uptown Girl” hits bookstores April 29.