Britney and sister Jamie Lynn are featured on this week's issue of OK! magazine.
They claim Brit is trying to convince JL to marry on-again off-again boyfriend Casey Aldridge, while Britney marries boyfriend Jason Trawick.
The idea came about after Brit and Jamie Lynn attended Lady Gaga's concert in L.A. in early August.
According to an insider, Britney was half-joking about creating “a huge, over-the-top Hollywood affair” at first. But when the two couples went back to Britney's Calabasas home, the sisters "couldn’t stop talking about it."
Britney's official site shot down these rumors as false.