Travis Kelce and his bro Jason made a lot of people do a double-take on their recent podcast with some love for Blake Lively ... the actress herself was among those taken aback, given her fallout with Taylor Swift.
Here's the deal ... the Kelce boys took a trip down memory lane on "New Heights," gushing over Blake’s movie breakout in 2005's "The Sisterhood of the Traveling Pants" .