Louis Tomlinson Was a "Complete Gentleman" During Valentine's Day Party With Danielle Campbell

One Direction boy-bander and The Originals star were lovey-dovey at pre-Grammy party

Louis Tomlinson and Danielle Campbell spent Valentine's Day 2016 together.

The twosome attended  Primary Wave's 10th Anniversary and Candy Crush Jelly Saga pre-Grammy party Sunday in West Hollywood, and as an eyewitness tells E! News exclusively, they were very lovey-dovey throughout the night!

The One Direction boy-bander was holding her from the back and kissing her cheeks and lips, says the onlooker. Louis, 24, "was very into her and you could tell," says a party-goer. "He kept on making her laugh."

The new dad was a "true, complete gentleman," according to an eyewitness.

Danielle seems to feel the same, too, and when she spoke exclusively to E! News Sunday, she had nothing but great things to say about Louis and all the 1D boys.

"I love their music and am a huge fan of them," gushed The Originals actress, 21. "I love their newest album [Made in the A.M.]…it's amazing!"

When asked if she thought Louis and bandmates Harry Styles, Niall Horan and Liam Payne would all have solo success at some point like former 1D member Zayn Malik, Danielle played it P.C. "Yeah, all of the boys are extremely talented," she told E! News exclusively, "and I know they will be very successful."

For more on Louis' new life as a dad, watch the video below.