Yes, anyone can say what they want but Britney is pretty consistent and knows what works with her voice. Isn't Heidi the one who took a song that Taylor Momsen wrote when she was like eight, lol?
Just checked, and yep. Don't know why I remembered that tidbit of info:
“I recorded it with a producer as a demo. Heidi Montag… just recently sang it and put it out as her single. “I’m like, ‘OK, dude, you’re singing an eight year old’s words, but that’s cool.'