Nouns ending in -elle are usually feminine.
The suffix often forms a diminutive feminine.
Is nouvelle masculine or feminine?
lanouvelle
The masculine form is nouveau
The rule behind it
95.1% of -elle nouns are feminine
In context
Je suis pleinement satisfait de ma nouvelle maison.
I am very pleased with my new house.
J'ai été surprise d'apprendre cette nouvelle.
I was surprised at the news.
Ma nouvelle décapotable Alfa Romeo est rouge clair.
My new Alfa Romeo convertible is light red.