Although reps for the reality couple deny it, the blogosphere is aflutter with whispers that The Hills’ Heidi Montag and hubby Spencer Pratt were no-shows at Holly Montag’s 26th birthday party last weekend… not because they had other plans… not even because there’s bad blood between the Montag sisters, but because “Heidi only goes places if she is getting paid.”

An insider told FOX News this week: “Holly was really wishing that her sister could just be a sister and stop by her birthday party… I mean, this is her sister and she wouldn’t even show up without a fee. That’s disgusting.”