Hayden was dressed in a silky printed tank top that stopped right at her growing bump and also gave a glimpse of her bra.
She stayed comfortable in a pair of stretchy navy maternity pants and held onto a black leather jacket.
The Nashville star showed off her natural beauty with little makeup on her flawless skin and wore her blonde locks back in a bun.
Meanwhile pregnant country crooner Holly, 33, was also casually attired in a sheer black top and faded blue jeans.