Taylor Momsen on Touring the World, Why Her Dad's Her 'Biggest Fan' – and Whom She's in Touch with from Gossip Girl

While many might still remember her as Little Jenny Humphrey from the beloved CW teen soap Gossip Girl or, perhaps, Cindy Lou Who from the live-action The Grinch reboot in 2000, Taylor Momsen made a major career change in 2007, starting the hard rock band The Pretty Reckless.

Gossip Girl's Identity Revealed in Series Finale!

Robert Pattinson, Aaron Paul, Bette Midler & More Casting News

Avril Lavigne & Deryck Whibley's Close (and Friendly!) Encounter in L.A.

Avril Lavigne had some special support at a party to launch her Abbey Dawn accessories line in L.A.: her ex-husband, Deryck Whibley!

The Sum41 rocker came out to the JustFabulous party at the Viper Room, and even shared a hug with Lavigne, who reportedly split from her boyfriend Brody Jenner in January. Whibley also posed for pictures at the event and congratulated Lavigne on her hard work.

Taylor Momsen and Jessica Szohr to Leave Gossip Girl

There’s going to be a shakeup on the Upper East Side!

Although Gossip Girl has been renewed for a fifth season, not all its fashionable characters will be back: Taylor Momsen, who plays Jenny Humphrey, and Jessica Szohr, who plays Vanessa Abrams, will not return as series regulars, PEOPLE can confirm.

Taylor Momsen Gets Booed in Scotland

Taylor Momsen suffered another onstage setback last week – only, this time, it was not of the nipple variety.

While performing in Glasgow with her band, The Pretty Reckless, the provocative performer, 17, excitedly told the audience they were “the craziest crowd in the whole of England.” Only one problem: Glasgow is in Scotland.

Taylor Momsen Still on Gossip Girl – Just Less Often

Don’t count Taylor Momsen out yet.

Despite reports that the 17-year-old actress was placed on an indefinite hiatus from the CW hit Gossip Girl after acting increasingly erratic, a source tells PEOPLE she’ll still be playing Jenny Humphry.

“She is still a series regular. She’s still totally a part of the show,” says the source. “Yes, you have seen less of her this season, but it’s dictated by creative [executives].”

Caught in the Act!

• Taylor Momsen sported her go-to Goth look – shredded tights and thigh-high leather books – for an afternoon shopping trip on L.A.’s Melrose Avenue. The Gossip Girl star was joined by her dogs and her Pretty Reckless bandmates, and appeared to be in “good spirits” as she stopped into Madison, according to a source.

Taylor Momsen Flashes Crowd at New York Concert

Taylor Momsen is turning into quite a shock rocker.

First, the Gossip Girl star posed on the November/December cover of Revolver in a barely-there outfit – and with some serious firepower, including a rifle, a handgun and a packed holster on her thigh.

Now the Pretty Reckless rocker is upping the shock factor: On Thursday in New York, Momsen, 17, flashed her breasts during a concert with her band.