Heavy D

's sudden death Nov. 8 was caused by a blood clot in the lung and not pneumonia as was first thought,

Craig Harvey

of the Los Angeles County Coroner's Office said Tuesday. Heavy D (

Dwight Arrington Myers

) also suffered from deep-leg vein thrombosis and heart disease. Harvey said the clot most likely formed during the rapper's recent flight from London to L.A.

Lady Gaga in Lancaster

There goes the neighborhood! Mega-selling chanteuse

Lady Gaga

, 25, is shopping for a manse in Lancaster County, reports local TV station CBS 21 (WHP-TV).

Gaga isn't going into dairy farming. She wants to be closer to her bf, Vampire Diaries actor Taylor Kinney, who hails from the area.

Various sources say Her GagaShip looked at a $1.7 mil house in the gated Bent Creek Community in Manheim Township.

In other GagaNews, the singer's former personal assistant, Jennifer O'Neill, 41, is suing her for $380,000 in unpaid overtime, says the New York Post.

Aunt Viv: I hate Will!

There was a conspicuous absence last week at a reunion bash for the cast of

Will Smith

's breakout TV hit,

The Fresh Prince of Bel-Air


Janet Hubert

, who played Will's Aunt Vivian for the first three seasons, wasn't invited. It's just as well, she tells TMZ. "I will never do anything with a [jerk] like . . . Smith," Hubert says, using a choice epithet. "He is still an egomaniac."

Hubert, 55, says she was unjustly fired from the show in '93 because she didn't flatter Smith's ego. (Daphne Maxwell Reid replaced her.)

Sinéad's mini-marriage

Sinéad O'Connor

, 45, has outdone

Kim Kardashian

for the shortest, saddest marriage of 2011. The singer is divorcing her fourth hub, therapist

Barry Herridge

, after 18 days.

Team Snooki in A.C.!

Novelist, sex symbol, and big-hair icon

Nicole "Snooki" Polizzi

has signed to promote a new boxing attraction,

the Hyland Brothers

, a trio of Irish sibs with actual boxing experience. They will show their moves at a night of boxing Jan. 28 at Resorts Casino Hotel in Atlantic City.