Yes, Jen is larger on her bottom half and wears her clothes very snug. Some time ago she addressed this herself on her social media page because many posters apparently felt the need to tell her that a time or two.
She said she loves her pants to be very form fitting -- case closed. Jen basically said she'll wear what she wants, and you do you; she put the nail in that discussion. She looks exactly how she wants to look in her clothes.
As long as no seams split, I say more power to her. Don't look at her for sizing assistance if that's what's throwing you off. She looks lovely.