United Kingdom, Nov. 4 -- Reese Witherspoon is convinced Jennifer Aniston is "not who people think she is".

The Hollywood actress, 49, has opened up about her long-running friendship with the former Friends star describing her as "very warm and friendly" and she went on to insist her pal isn't at all like her tabloid persona and is "not holding onto stuff".

During an appearance on Dax Shepard's Armchair Expert podcast, Reese said: "We've known each other so long and we are very different people. She's really warm and welcoming. She's a big host. She's very warm and friendly. I think I'm more nerdy.

"I used to be really rigid. I think my edge has softened. Life does that to you. But Jen, I will say, I've known Jen 25 years, 26 years ......