Singers Lady Gaga and Adam Lambert are taking on Europe.

Lady Gaga's outrageous Monster Ball Tour kicked off with a performance in Dublin, Ireland. She'll return stateside after performing two shows in Paris, France near the end of December.

After a show in Zagreb on Friday, the Alejandro singer tweeted to her nearly 7 million fans: “Never could I have imagined the connection we share. Hrvatska, 2nite there was no politic, no economy, no society. Just us. Monster ball.”

Lady Gaga, who is openly bisexual, urged senators in September to vote to repeal “Don't Ask, Don't Tell,” the law that bans gay and bisexual troops from serving openly. At a rally, held near the University of Southern Maine and tiled #4THE14K, a reference to the nearly 14,000 gay and lesbian soldiers discharged under the policy, Lady Gaga made an impassioned plea for Congress to end the policy.

“Equality is the prime rib of America,” she said, referring to a meat dress she wore to the MTV Video Music Awards. “But because I am gay, I don't get to enjoy the greatest cut of meat my country has to offer.”

The 28-year-old singer also released a video imploring her fans to join the cause.

Lambert, the American Idol season 8 runner up, kicks off the European leg of his Glam Nation tour on Saturday with a performance in Helsinki, Finland. His final show before heading home will be in London on November 29.

An E! True Hollywood Story set to premiere on November 21 will profile the rock star's meteoric rise to fame.

In the hour-long special, the 28-year-old talks about his decision to share his personal life with his fans.

“My fans have been really supportive of my choice to be open and upfront about my sexuality and my lifestyle,” Lambert says. “I have come from the belief that hiding something from people and manipulating what they think of you is far more offensive and disrespectful than just being upfront and being who you are.”

At a tour stop in Malaysia, Lambert urged troubled gay teens considering suicide to ignore the hate and focus on the love.