Billie Eilish's brother Finneas admits that touring without her is 'bittersweet'

FINNEAS opened up about his upcoming solo world tour and admitted that leaving behind his younger sister Billie Eilish is 'bittersweet.'

On Thursday, the 27-year-old singer-songwriter — who has accompanied Billie, 23, on most of her headlining tours — also got candid about not joining her for her ongoing Hit Me Hard and Soft Tour while on the Therapuss podcast.

'It’s been very bittersweet. I only decided to do it because I knew that I couldn’t be in two places at once,' he told host Jake Shane.

'I can’t do my own tours and her tour at the same time, and I don’t want to prevent her from touring as much as she wants to tour.'

Nonetheless, the Oscar winner praised her 'amazing' concert tour, claiming that his absence does not take away from the show. On past tours, FINNEAS played the electric guitar and drums for his sister. 

'And then the sweet part has just been I’ve seen the show a few times and it’s amazing. I think her show is incredible. It doesn’t suffer at all because I’m not there,' he said.

FINNEAS recently made a surprise appearance at Billie's Los Angeles Kia Forum stop on the Hit Me Hard and Soft Tour, which he referenced in the interview. 

'She’s great, and I’ve come out and done a song or two, but I really think she’s doing the best show she’s ever done. So that’s lovely,' he shared. 

He is also opening for the What Was I Made for singer on Saturday to wrap the American leg of her tour.

And just because he is gearing up to hit the road on his own doesn't mean he doesn't think of his sister — the guitarist admitted he regularly makes time to check in on Billie. 

'I call her constantly. You know, a lot of the time she’s just kind of being an athlete and resting and doing physical therapy and stuff like that,' he added.

'I just make sure she’s doing okay. I’ve always said, leading up to it and since she left, [he will say] "If you ever need some company, I’ll jump out and just come hang out with you, keep you company on the road."'

FINNEAS' For Cryin’ Out Loud! The Tour is slated to kick off in early January in New Zealand on January 7.

The concert tour has 36 scheduled stops including Chicago, Illinois; Nashville, Tennessee; Detroit, Michigan; Los Angeles, California; Dublin, Ireland and Paris, France.

The show is set to wrap on May 9 in Cologne, Denmark and has already received rave reviews from critics and fans alike. 

FINNEAS' remarks about the BITTERSUITE singer comes after she admitted she has experienced 'dark times' while on tour.

Just weeks ago she told Vogue that she viewed her negative emotions as a 'temporary' stage in her life and that she has learned to embrace playing live and hopes to 'enjoy' it. 

Billie told the outlet: 'I've had some really dark times on tour. For a long time I was kind of living like it was temporary. Like, yeah, I'm touring for now and it's kind of unpleasant, and whatever. It'll be over.

'And the truth is, it's the rest of my life,' the i love you singer said.

Billie also revealed to fans that she felt 'lonely,' admitting her connection with music had changed over time. 

'I didn't realize that I could make touring enjoyable. I just was very lonely for many years, and I'm not interested in that anymore. I want to enjoy the show as well as my days,' she said.

Lately, the Birds of a Feather singer has been enjoying playing music just for fun, rather than because of her work.

She added: 'I'm a musician and you'd think I would've done that. But things blew up for me at an age when I would've been jamming with buddies. And because it was my career, I was not interested.

'So for the first time ever, I'm jamming, and it's amazing. It's so nice to not have pressure of like, Is this going to be the next single? It's like, No, we're just here. And it's just right in the moment.'