Unmasked! Ben's New Babe

She looks like Jen -- Only Blond.

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BEN AFFLECK is getting busy with his new “Jennifer Garner look alike” girlfriend — and only The National ENQUIRER has the first photos of the couple’s Independence Day weekend London lovefest!

Captured in world exclusive photos shown here is Emmy-winning blond knockout Lindsay Shook us, who sources told The ENQUIRER has long worked as a big-shot producer at NBC’s “Saturday Night Live.”

Our spies told The ENQUIRER: “The couple looked happy and thrilled. They spent most of the weekend together before Ben jetted back to L.A. to be with Jen and his kids. The ironic thing is she looks just like Jen — only blond!

“Lindsay flew in from Los Angeles and spent four nights in London at the same luxury hotel as Ben!” a source said, adding that on June 29, the new couple enjoyed a decadent seven-course meal at the swanky Gymkhana Indian restaurant in Mayfair.

“The very next day, they were together on the set of ‘Justice League’ in Leavesden Studios where Ben was filming re-shoots,” dished the source.

On Saturday night, July 1, Ben, 44, treated Lindsay, 37, to a play on London’s West End.

“They went to see ‘The Ferryman’ at the Gielgud Theatre,” squealed our source.

“They left together and went straight back to their hotel!

“They drove into the underground parking garage to avoid being observed.”

On Sunday, July 2, the couple flew back to Los Angeles together from London’s Heathrow Airport.