Making a relationship work isn't easy. Making a marriage work is even harder. Making a marriage work when you're Britney Spears and Kevin Federline can be downright challenging.

With Britney Spears pregnant and Kevin Federline headed out on tour (using a bus), the couple's marriage is beginning to feel strained. This isn't to say their headed back towards the rumors of a divorce, but the pressure is definitely on. Federline told ContactMusic that, since the couple spend very little time together, "It's definitely going to be hard. It'll have to be worked at, but that's every relationship."

Despite the relationship suffering under the strain of their careers, it's also seen a highlight in the past week. Sean Preston Federline, the couple's first child, took his first steps earlier in the week. Federline told the media "He's still figuring out the whole walking thing. He took his first steps the other day."

The marital troubles will be taking a back seat, though, as the couple are preparing to renew their wedding vows. The story originally came out after the Britney Spears interview with Matt Lauer, and now it seems to be a reality.

It's felt that the renewal of the wedding vows will give the couple a chance to celebrate their wedding more elaborately. Their wedding, back in 2004, was a rush wedding, with only 20 or 30 guests attending.

Speaking about his career, Kevin Federline is ready for his bus tour, but doesn't want to do it alone. Apparently, Federline wants nothing more than to bring a pregnant Britney Spears and a now-walking Sean Preston Federline on the bus tour with him.

The Boston Globe quoted Federline as gushing "I'm going to try to do the bus thing and bring everyone along."

Federline went on to say that he hopes the time he spends with Britney can help his marriage. "I feel bad. It's been a while since I've been able to take her away."

On the flipside of the coin, Britney Spears isn't being a slouch either. Despite being eight months pregnant, ContactMusic reports that Spears was spotted heading into Conway Studios where she's been recording new tracks. Spears even had Sean Preston in tow, so he could get a taste of her mom's new music.