Bristol Palin-Levi Johnston Engagement Off; Briana Plum Facebook Pic to Blame!

It looks like the second engagement of Bristol Palin and Levi Johnston is off, but that the rumor of him knocking up his ex-girlfriend is not the reason.

His flirting with another ex-girlfriend is!

Bristol, 19, called off engagement #2 to Levi, 20, last week following a huge fight over one of his ex-girlfriends - and we don't mean Lanesia Garcia.

Garcia was outed as Levi's possible second baby mama this week, but new reports say that the Playgirl model is not the father of her unborn child.

Luckily for our boy, he wasn't the one among the "three potential fathers" to have impregnated Lanesia during the probable week of conception.

But Bristol Palin still has beef with him - and Briana Plum.

Levi Johnston apparently got naked a lot in between his two engagements to Bristol Palin, and we're not even talking about his Playgirl photo shoot for once.

"Lanesia and Levi have dated off and on over the past few years but he's not the father of that baby," says a source to E! Online. "Lanesia's other ex-boyfriend is the father. She's not the reason that [Bristol and Levi] broke it off."

That would be Levi's other ex, Briana: "There was an interview with her and Bristol wasn't happy about things she said. There was also some picture on Facebook of him and Briana and Bristol just said, ‘Let's hold off on the engagement.'"

Neither Palin nor Johnston have confirmed this, but the parents of 19-month-old Tripp just got engaged again a few weeks ago, landing them on the cover of Us Weekly amid rumors of shopping a reality show featuring their young family.

Guess even a huge paycheck can't keep some fake relationships intact.

THG Week in Review: July

Below, our staff members take a look back on the last seven days in celebrity news and rumors - and we've certainly got a lot to talk about.

Visit our site daily and follow us on Facebook and Twitter for 24/7/365 updates. Now, for some of the top stories we covered this past week:

• The Mel Gibson tapes. Where to start? All the tapes / voicemails were recorded February 18. Oksana Grigorieva says she taped him because she feared for her life. Whether witnesses saw him attack her January 6 is the question.
• She's being treated like a common criminal in the slammer, but Lindsay Lohan may be set free as early as this weekend. She's lobbying for time with family before being shipped off to rehab following her release - don't bet on it.
• A major shakeup at American Idol leaves Randy Jackson the last judge standing, with J. Lo and Steven Tyler replacing Ellen and Kara.
• The appearance by Barack Obama on The View was mostly light, and sparked criticism from many, including former Gov. Sarah Palin.
• In other Palin news, Bristol is reportedly pissed over a report that Levi put it to Lanesia Garcia and may become a baby daddy again!

This is reportedly the new American Idol panel.

• Jon and Kate Gosselin reached a custody settlement.
• A supposed set of Angelina Jolie drug photos surfaced.
• Zac Efron did the strip club thing ... Zac Efron style.
• Justin Bieber is a sinner against God (some think).
• Kendall Jenner is all good with her bikini pics, though.
• Tiffany came to the defense of Miley. Yes, Tiffany.
• People really don't like Scott Disick as a general rule.
• Jersey Shore is back, and better/worse than ever.
• The Bachelorette ending(s) spark debate among fans.
• Mocienne Petit Jackson claimed to be MJ's love child.

Most people have Bieber Fever, but some say he's a sinner.

• Baby news about six months from today: Orlando Bloom and Miranda Kerr (rumored); Melissa Rycroft and Tye Strickland (confirmed).
• Couples: Alex Beh is dating Jennifer Love Hewitt; Kroy Biermann is dating Kim Zolciak; Eddie Cibrian is moving in with LeAnn Rimes.
• Wedding Bells: Linda Hogan and Charlie Hill are engaged. Hey, at least he can drink at his own wedding to the 50-year-old. Barely.