Entertainment buzz: Facebook's top 10 moments of the week

New trailers surfaced this week, building buzz for the fall movie season. And music fans rejoiced when Pink Floyd and Garth Brooks announced plans for new albums.

Also Harry Potter is back.

Facebook has tallied the top 10 buzziest stories in entertainment this week, and all of those topics made the most-talked-about list. What had you talking? See what you missed in this exclusive list on CBSNews.com.

1. J.K. Rowling publishes a new Harry Potter story

Fans of "Harry Potter" were in luck this week when author J.K. Rowling provided a glimpse of the Boy Who Lived -- now mysterious, married and going gray -- in a new story posted Tuesday on her Pottermore website.

The 1,500-word story describes Harry, about to turn 34 (his birthday is July 31), attending the final of the Quidditch World Cup with his family and pals Ron and Hermione.

2. Pink Floyd plans to release its first new album in 20 years

Pink Floyd will shine on. The band is gearing up to release a new album, according to David Gilmour's wife, Polly Samson, who first leaked the news.

The upcoming set -- the band's first in 20 years -- is expected out in October.

Called "The Endless River," the album stems from Pink Floyd's '90s recording sessions, the same ones that culminated in the group's last studio release, 1994's "The Division Bell."

Pink Floyd later confirmed the album news on Facebook:

3. Crosby, Stills and Nash appear on NBC's "Tonight Show with Jimmy Fallon"

Crosby, Stills and Nash got "Fancy" on "The Tonight Show with Jimmy Fallon" Monday night.

David Crosby, Stephen Stills and Graham Nash lent their harmonies to a rendition of the Iggy Azalea summer hit. Fallon accompanied the trio doing his best Neil Young. So it was almost like a CSN&Y reunion. Almost.

Miss it or want to watch again? Check it out below:

4. Actress Eva Mendes expecting first child with Ryan Gosling

You mean he's taken? Really taken? Seems so. Sigh.

Longtime couple Eva Mendes and Ryan Gosling are expecting their first child together.

Although they haven't released a statement about it, multiple reports say Mendes is seven months pregnant. Will likely be a beautiful child.

5. New "Gone Girl" film trailer released

We got a better idea about how Gillian Flynn's "Gone Girl" book will adapt to the big screen this week thanks to a new trailer from the David Fincher-directed film.

This one lays out more evidence against Nick Dunne (Ben Affleck), who becomes the prime suspect after his wife, Amy (Rosamund Pike), mysteriously disappears on their fifth wedding anniversary.

"Gone Girl," which also stars Neil Patrick Harris and Casey Wilson, lands in theaters on Oct. 3.

Do you think it will be as good as the book?

6. Joan Rivers' appearance on "Late Show with David Letterman" on CBS

Last weekend, Joan Rivers walked out on CNN anchor Fredricka Whitfield during a satellite interview.

Then on Tuesday, during a visit to "Late Show with David Letterman," the comedienne got a taste of her own medicine.

See what happened in the clip below:

7. Piers Morgan to donate to children's hospital after losing World Cup bet

This sounds like a bet gone wrong -- gone right in the end. The former CNN host lost a Twitter wager to soccer player Joey Barton this week when Brazil lost to Germany. He ended up losing and asked Barton to name his favorite charities so he can donate nearly $7,000 to the organizations.

8. A new trailer for the next "Hunger Games" film is released

The latest teaser for "The Hunger Games: Mockingjay - Part 1" surfaced this week.

Like the previous teaser, this one opens with Snow (Donald Sutherland) speaking to Panem, with Peeta (Josh Hutcherson) at his side. A stoic Johanna Mason (Jena Malone) is there too, but that's not the biggest surprise.

That would be that as Panem's leader is speaking, the Capitol-approved dispatch gets disrupted with a transmission from Beetee (Jeffrey Wright) in District 13.

His very important message? "The Mockingjay lives."

"The Hunger Games: Mockingjay - Part 1" opens in theaters on Nov. 21.

9.Courtney Love joins cast of "Sons of Anarchy" on FX

Courtney Love is heading to the small screen for the final season of "Sons of Anarchy." FX has tapped the rocker to play a pivotal role for season 7.

Love will appear in a multi-episode arc as Ms. Harrison -- the pre-school teacher of Jax's (Charlie Hunnam) eldest son Abel. Her character reportedly takes a special interest in Abel, which will likely catch the attention of the boy's mother, Wendy (Drea de Matteo).

10. Garth Brooks concerts in Ireland may be canceled

Garth Brooks made a lot of headlines this week. First he scrapped five concerts in Ireland. But then on the brighter side -- on Thursday, the country superstar held a press conference announcing an upcoming world tour and new album.

The 52-year-old singer also revealed that he's releasing his music digitally for the first time. Hooray! Welcome to the 21st century, Brooks.

*Buzz rankings reflect the top entertainment topics being discussed on Facebook, July 6-9, in the United States. Rankings are based on both frequency and momentum: the Facebook conversations that not only got a lot of buzz during the week, but also saw a notable increase compared with the previous week.